FileProInfo - It's All About Files, Software, Online Tools - 100% Free
UpReports - Grow your business online
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
RBLS - Building infrastructures for innovation
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Inostudio - Everyday people creating world-class solutions