Color coded Windows 7 Preview Pane?
Currently it is not available and there is no add-on I can find anywhere. It has been discussed and commented about so no doubt there is demand for it. I expect an extension to come out soon.
Just found this that supports the formats below:
http://www.smartftp.com/client/addons/sourcepreview
ActionScript (.as, .mx)
ASP (.asp)
ASPX (.aspx)
AutoIt (.au3)
Bash (.sh, .bsh)
Batch (.bat, .cmd)
Caml (.ml, .mli, .sml, .thy)
C (.c)
C++ (.cpp, .cxx, ,.cc, .h, .hxx, .rgs)
C# (.cs)
CSS (.css)
Diff (.diff, .patch)
Fortran (.f, .for, .f90, .f95, .f2k)
Ini (.ini, .inf, .reg, .url)
Inno Setup (.iss)
Java (.java)
JavaScript (.js)
Lisp (.lsp, .lisp)
Makefile (.mak)
Matlab (.m)
NFO (.nfo)
NSIS (.nsi, .nsh)
Pascal (.pas, .inc)
Perl (.pl, .pm, .plx)
PHP (.php, .php3, .phtml)
Python (.py, .pyw)
Resource (.rc)
Smalltalk (.st)
TeX (.tex)
SQL (.sql)
VB (.vb)
VBScript (.vbs)
XML (.xml, .xsd, .xsml, xsl, .kml)
I know the question is old. But just as other can benefit from my search I just found out a good preview handler.
https://github.com/RRUZ/delphi-preview-handler
It handles many types like c,c++,c#,.asm, and others. Plus it has support for themes.
There is a Code Preview Handler, but it supports only the extensions .cs, .vb, .js and .sql . The source code is available and it doesn't look too complex to create a Preview Handler (well, sort of, I wouldn't know how to do one).
I tried adding other extensions to the Code Preview Handler with the tool Preview Handler Editor but it doesn't work, the preview pane is blank (at least for the .pl files I tried).
Edit: you have also a pack of Preview Handlers here, that support the following filetypes:
* ActionScript (.as)
* ASPX (.aspx)
* C# (.cs)
* CSS (.css)
* Diff (.diff, .patch)
* DOS (.bat, .cmd)
* JavaScript (.js)
* Ruby (.rb, .rhtml, .rjs) thanks to Ivan Porto Carrero
* SQL (.sql)
* VB (.vb)
There's an extension that supports many common coding formats here: http://blog.tatham.oddie.com.au/2006/12/20/vista-and-office-2007-preview-handler-pack-released/