My RUN.bat files won't open!

BqnditX said:

I typed "java -jar" and behind -jar I put the full file name. It said that it was unable to acces the .jar file.

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There is difference in terminology between "open" and "execute". "Open" opens the file for editing. "Execute" runs the program and all its side effects.
Not sure which you are trying.
To view content of .jar file, type
jar tf filename.jar
To execute the .jar, type
java -jar filename.jar
providing the java version is right for the .jar file and there is a Main-class manifest header in the filename.jar, and the filepath is reachable, then it should execute.

BqnditX said:

Do you have or know any other methods I can use to try to open an empty RUN.bat file?

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RUN.bat:
what is the reported size of the file? If it is 0 KB then that could be a problem for Windows.
If the file is greater than 0 KB, then you could try typing out the contents of the file with
TYPE RUN.bat
Or you could try adding a new command to the existing file by piping it:
ECHO PAUSE >> RUN.bat
that might make the file big enough to open normally.