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File-extensions.org lists following files for .3 extension:. Source: about 1 year ago
Teachable - Create and sell beautiful online courses with the platform used by the best online entrepreneurs to sell $100m+ to over 4 million students worldwide.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Clever - syncing between education applications for K-12 schools
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Claroline - Claroline is a collaborative eLearning and eWorking platform.
FILExt - Open, view and convert files online