diff --git a/filter/tex/mimetex.darwin b/filter/tex/mimetex.darwin
new file mode 100755
index 00000000000..e0064f182ac
Binary files /dev/null and b/filter/tex/mimetex.darwin differ
diff --git a/filter/tex/mimetex.exe b/filter/tex/mimetex.exe
new file mode 100755
index 00000000000..6b818a5aad5
Binary files /dev/null and b/filter/tex/mimetex.exe differ
diff --git a/filter/tex/mimetex b/filter/tex/mimetex.linux
similarity index 100%
rename from filter/tex/mimetex
rename to filter/tex/mimetex.linux
diff --git a/filter/tex/pix.php b/filter/tex/pix.php
index 872b94d4d10..7613830bbdf 100644
--- a/filter/tex/pix.php
+++ b/filter/tex/pix.php
@@ -46,7 +46,17 @@
             $texexp = str_replace('>','>',$texexp);
             $texexp = preg_replace('!\r\n?!',' ',$texexp);
             $texexp = '\Large ' . $texexp;
-            system("QUERY_STRING=;export QUERY_STRING;$CFG->dirroot/$CFG->texfilterdir/mimetex -d ". escapeshellarg($texexp) . "  >$pathname");
+            switch (PHP_OS) {
+                case "Linux":
+                    system("QUERY_STRING=;export QUERY_STRING;$CFG->dirroot/$CFG->texfilterdir/mimetex.linux -d ". escapeshellarg($texexp) . "  >$pathname");
+                break;
+                case "Windows":
+                    system("$CFG->dirroot/$CFG->texfilterdir/mimetex.exe -d ". escapeshellarg($texexp) . "  >$pathname");
+                break;
+                case "Darwin":
+                    system("QUERY_STRING=;export QUERY_STRING;$CFG->dirroot/$CFG->texfilterdir/mimetex.darwin -d ". escapeshellarg($texexp) . "  >$pathname");
+                break;
+            }
         }
     }