Windows XP file manager ignores php files. It worked before but automatic updates changed that. It really sucks because Moodle programmers must do file search all the time.
I found a nice freeware filemanager. You can download it from:
http://www.wanari.com/products/gynav/Index.jsp?isNS=false
Teemu
I use a freeware program called AM Code Search for searching through code. You can download it from this page:
http://www.aignes.com/products.htm
http://www.aignes.com/products.htm