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JAR file association

Certain Java archive (JAR) files, such as the Forge installer/launcher JARs, are designed to be self-executing; if double-clicking the file does nothing or opens an archive manager (like WinRAR/7-zip) then you need to adjust the Windows registry to fix the file association.

A program has been created to do this automatically, here: https://johann.loefflmann.net/downloads/jarfix.exe

If the problem persists after running this program, let me know.

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