diff --git a/filter/activitynames/filter.php b/filter/activitynames/filter.php
new file mode 100644
index 00000000000..d1553c6bc23
--- /dev/null
+++ b/filter/activitynames/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_activitynames
+ * @copyright Eloy Lafuente (stronk7) {@link http://stronk7.com}
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/algebra/filter.php b/filter/algebra/filter.php
new file mode 100644
index 00000000000..674cdb7bfd8
--- /dev/null
+++ b/filter/algebra/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_algebra
+ * @copyright Zbigniew Fiedorowicz <fiedorow@math.ohio-state.edu>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/codehighlighter/filter.php b/filter/codehighlighter/filter.php
new file mode 100644
index 00000000000..c25406bd0b4
--- /dev/null
+++ b/filter/codehighlighter/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_codehighlighter
+ * @copyright Meirza <meirza.arson@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/data/filter.php b/filter/data/filter.php
new file mode 100644
index 00000000000..0fa91f49f8c
--- /dev/null
+++ b/filter/data/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_data
+ * @copyright Vy-Shane Sin Fat
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/displayh5p/filter.php b/filter/displayh5p/filter.php
new file mode 100644
index 00000000000..aaa32bb6ebd
--- /dev/null
+++ b/filter/displayh5p/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_displayh5p
+ * @copyright Victor Deniz <victor@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/emailprotect/filter.php b/filter/emailprotect/filter.php
new file mode 100644
index 00000000000..ca41015ab5f
--- /dev/null
+++ b/filter/emailprotect/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_emailprotect
+ * @copyright Mike Churchward
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/emoticon/filter.php b/filter/emoticon/filter.php
new file mode 100644
index 00000000000..680a6e491c1
--- /dev/null
+++ b/filter/emoticon/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_emoticon
+ * @copyright David Mudrak <david@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/glossary/filter.php b/filter/glossary/filter.php
new file mode 100644
index 00000000000..b22fd5c36b3
--- /dev/null
+++ b/filter/glossary/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_glossary
+ * @copyright Eloy Lafuente (stronk7) {@link http://stronk7.com}
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/mathjaxloader/filter.php b/filter/mathjaxloader/filter.php
new file mode 100644
index 00000000000..ee573f5b11e
--- /dev/null
+++ b/filter/mathjaxloader/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_mathjaxloader
+ * @copyright Damyon Wiese <damyon@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/mediaplugin/filter.php b/filter/mediaplugin/filter.php
new file mode 100644
index 00000000000..e69f3593506
--- /dev/null
+++ b/filter/mediaplugin/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_mediaplugin
+ * @copyright Martin Dougiamas  {@link http://moodle.com}
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/multilang/filter.php b/filter/multilang/filter.php
new file mode 100644
index 00000000000..da6cf66ff63
--- /dev/null
+++ b/filter/multilang/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_multilang
+ * @copyright Gaetan Frenoy <gaetan@frenoy.net>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/tex/filter.php b/filter/tex/filter.php
new file mode 100644
index 00000000000..c563f768aab
--- /dev/null
+++ b/filter/tex/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_tex
+ * @copyright Zbigniew Fiedorowicz <fiedorow@math.ohio-state.edu>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/tidy/filter.php b/filter/tidy/filter.php
new file mode 100644
index 00000000000..f4cfd134963
--- /dev/null
+++ b/filter/tidy/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_tidy
+ * @copyright Hannes Gassert <hannes@mediagonal.ch>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);
diff --git a/filter/urltolink/filter.php b/filter/urltolink/filter.php
new file mode 100644
index 00000000000..d3d406f7627
--- /dev/null
+++ b/filter/urltolink/filter.php
@@ -0,0 +1,28 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * File only retained to prevent fatal errors in code that tries to require/include this.
+ *
+ * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
+ * @deprecated This file is no longer required in Moodle 4.5+.
+ * @package filter_urltolink
+ * @copyright David Mudrak <david@moodle.com>
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+defined('MOODLE_INTERNAL') || die();
+
+debugging('This file is no longer required in Moodle 4.5+. Please do not include/require it.', DEBUG_DEVELOPER);