Based on our record, File-Extensions.org seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
File-extensions.org lists following files for .3 extension:. Source: about 1 year ago
Senuto - Get more search data and increase your sales
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
UpReports - Grow your business online
FileInfo.com - FileInfo is the central file extensions registry and contains a database of over 10,000 file types.
Cooltimedia - Content Maketing
FILExt - Open, view and convert files online