diff --git a/includes/mime_detect.inc b/includes/mime_detect.inc
index e76975d6..cfdcf706 100644
--- a/includes/mime_detect.inc
+++ b/includes/mime_detect.inc
@@ -184,6 +184,41 @@ class MimeDetect {
     "ogg" => "audio/ogg",
     "flac" => "audio/x-flac",
     "wav" => "audio/vnd.wave",
+    // Chemical:
+    // MDL Molfile.
+    "mol" => "chemical/x-mdl-molfile",
+    // XYZ format.
+    "xyz" => "chemical/x-xyz",
+    // PDB.
+    "pdb" => "chemical/x-pdb",
+    // ChemDraw 3D.
+    "c3d"=>"chemical/x-chem3d",
+    // ChemDraw file.
+    "chm" =>"chemical/x-chemdraw",
+    // Crystallographic Information File.
+    "cif" =>"chemical/x-cif",
+    // Chemical Markup Language.
+    "cml" =>"chemical/x-cml",
+    // GAMESS Input.
+    "inp" =>"chemical/x-gamess-input",
+    // GAMESS Output.
+    "gam" =>"chemical/x-gamess-input",
+    // General output file.
+    "out"=>"application/octet-stream",
+    //Gaussian Cube.
+    "cub" =>"chemical/x-gaussian-cube",
+    // Gaussian 98/03 Cartesian Input.
+    "gau" =>"chemical/x-gaussian-input",
+    // Corel Multimedia Manager v6 Album.
+    "gal" =>"application/octet-stream",
+    // JCAMP Spectroscopic Data Exchange Format.
+    "jdx" =>"chemical/x-jcamp-dx",
+    // OpenDX Grid.
+    "dx" =>"chemical/x-jcamp-dx",
+    // MOPAC Cartesian.
+    "mop" =>"chemical/x-mopac-input",
+    // General Input File.
+    "in" =>"application/octet-stream",
     // Compressed formats:
     // (note: http://svn.cleancode.org/svn/email/trunk/mime.types)
     "tgz" => "application/x-gzip",