By default catdoc is not available for Windows, however a Win32 version can be downloaded here:
http://blog.brush.co.nz/2009/09/catdoc-windows/
I tested it and it appears to work just fine.

Also I got errors for both xpdf and catdoc when trying to put the paths in (be it in c:\path\xpdf\ or c:/path/xpdf/ format), the error was:
"Warning: system() [function.system]: Unable to fork"

The solution was to add the Internet Guest Account (IUSR) to CMD.EXE as per:
http://www.somacon.com/p255.php

This may open up a security hole, I tried changing PHP into Safe Mode and limiting the safe_mode_exec_dir in PHP.INI but it didn't seem to have any effect even after an IISRESET.