Hi SomeROMHacker
Have you installed Up to data Java and the JRE (Java Runtime Environment) on your PC?
If so you should reset your jar file associations and see if those jar files will execute . ..
It is not easy to set the jar file associations, click the link below to download JarFix, which will do that for you . . .
JarFix, is just a tiny free exe that does not need to be installed . .
https://johann.loefflmann.net/en/software/jarfi...
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