How can I find out about an unknown file extension?
Solution 1:
FILExt - The File Extension Source
Solution 2:
I suggest you give a look at Whotsit.org. There's no file extension/format I was unable to find on that site over the last 10 years or so.
Solution 3:
You could also look at the contents of the file, using a tool like the Unix file command.
Solution 4:
Windows or Linux software solution
http://mark0.net/soft-trid-e.html