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File-extensions.org lists following files for .3 extension:. Source: about 1 year ago
Niko Niko - Employee Engagement
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
#TrelloAnnualReport - Get some fun free stats for your team's year on Trello!
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
FILExt - Open, view and convert files online