Fileinfo.com

Sites like this could be malicious, this one isn't.

I got Windows file viewer lite. Contains adware.

Download says virus will not be going to this site again.

Has been useful to me several times. Good site!

this site doesn't know what it is talking about when they warn you from removing the vir extension (fine) and at the same time, IF YOU WANT TO OPEN THEM (not manually!) urge you to REMOVE them through antivirus program!
The downloadable file Viewer IS NOT THE SAME AS Free File Viewer that could be recommended instead (I use it frequently without any problems) McAfee warns for that page of the site.
Pianosa below says this about the file Viewer (connected to the original downloading site): "This is not a straightforward download of a free program. The program that is offered is wrapped in a downloader that will install other unnecessary and unwanted rogue software items on your computer. Avoid."
In spite of that he marks the fileinfo.com site as good although it offers you to download the very same Viewer!

Very helpful! Great site, recommended for all…

Safe site that provides information about file extensions, though the software that this site links to should be checked.

Really useful website

@shazza that is just a advertisement
Also very good and informative.

Good for learning about files.

Good site, one that I visit more often than I ought to have to, since the bad guys are always coming up with ways to give you an extension that can be booby-trapped.

Te best site for files. EX: .COM, .ZIP, .EXE, etc…

Good Site, very useful informative

Much better than Microsoft's extension finder.

Informative.

Helpful.