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Actually, NO.
You need a decompiler to convert class files to java source files.
JAD is a Java Decompiler that can do it for you.
install java, then it will work
NOTE: The Game Maker Decompiler is ILLEGAL. You can only use it to decompile your own games if you lost the GMK, but still have the EXE.
You'll need a brain first. Sadly, they're hard to source.
You can't. You have to extract them directly from the Movies. Use a Flash Decompiler.