diff --git a/src/sampleconf/mimeconf b/src/sampleconf/mimeconf
index 654cf39d..1d75cff8 100644
--- a/src/sampleconf/mimeconf
+++ b/src/sampleconf/mimeconf
@@ -142,6 +142,9 @@ text/rtf = exec unrtf --nopict --html;mimetype=text/html
 text/x-c = internal
 text/x-c++ = internal
 text/x-c+ = internal
+text/x-csharp = internal text/plain
+text/css = internal text/plain
+application/javascript = internal text/plain
 text/x-csv = internal text/plain
 text/x-fictionbook = exec rclfb2
 text/x-gaim-log = exec rclgaim
diff --git a/src/sampleconf/mimemap b/src/sampleconf/mimemap
index 0d53d3be..d52c11c2 100644
--- a/src/sampleconf/mimemap
+++ b/src/sampleconf/mimemap
@@ -18,6 +18,9 @@
 .cc  = text/x-c
 .cxx = text/x-c
 .hxx = text/x-c
+.cs = text/x-csharp
+.css = text/css
+.js = application/javascript
 .f   = text/x-fortran
 .py  = text/x-python
 .awk = application/x-awk
diff --git a/src/windows/mimeconf b/src/windows/mimeconf
index 2e7d70a5..07724b04 100644
--- a/src/windows/mimeconf
+++ b/src/windows/mimeconf
@@ -142,6 +142,9 @@ text/rtf = exec unrtf --nopict --html;mimetype=text/html
 text/x-c = internal
 text/x-c++ = internal
 text/x-c+ = internal
+text/x-csharp = internal text/plain
+text/css = internal text/plain
+application/javascript = internal text/plain
 text/x-csv = internal text/plain
 text/x-chm-html = internal text/html
 text/x-ini = internal text/plain