Ever wonder that application a file is related to? Of course, we know what .doc or .xls means and even .pdf. What about others?
This site is based on a huge database of file extension information, mainly (but not exclusive to) the Microsoft Windows, MAC OS X and Unix based operating systems.
You can search by category:
* Audio files * Backup files
* Compressed files * Data files
* Disk files * Image files
* Text files * Video files
* Developer files * Encoded Files
* Executable files * Font files
* Game files * Miscellaneous files
* Plugin files * Settings files
* System files * Web files
Or just search by extension. According to the site, they have 10,086 extensions listed. So chances are, they have the one you are asking about. However, if you do find one that isn’t listed you can add it yourself once you find out what it is.
See this resource here: http://dotwhat.net/
