Właśnie znalazłem to, które obsługuje poniższe formaty:
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)