What is a .3 file extension?

1

TrID

You can try to use some tools that detect what extenstion file should have based on the content of the file, if the file is small, you can try https://www.checkfiletype.com/, otherwise you can try this tool: https://mark0.net/soft-trid-e.html.

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2

File-Extensions.org

File-extensions.org lists following files for .3 extension:.

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