What's that file extension ??

[Andrew McDonald]

For anyone who's ever received a file with an extension they didn't know (or trust) try this site.
http://filext.com/

Regards & Merry Christmas
Andrew McDonald

 

[michael puckett]

Or try http://www.wotsit.org ( ignore the dumb banner at the top ).

WotSit ain't as pretty as FileXT, but it generally provides more information about the 1's and 0's of the file format.