Glad you got a workaround for it.
Have you tried Nerps's custom fork of 1.4? It's self contained and has its own java built in. So, all your java problems would be gone.http://maptool.nerps.net/
The dev version has it's own java version built in as well. After installing java and he still has to associate the extension to java then there is something up with his system for sure.
Personally, I would remove all versions of java and the .maptool folder and remove the associate he made for the .jar file, remove the jar runner and then restart the computer.
The newer versions of java uses an MS symlink that's held here (C:\ProgramData\Oracle\Java\javapath), but that's not the actual file to be run. Perhaps when the associate was made it was made to that file which I could see why he would get the error he did.
Then I would download the 64bit java (http://javadl.oracle.com/webapps/downlo ... eId=216434
) and install MT 18.104.22.168
under the downloads folder and run the launcher. Hopefully, that would do the trick. I would not continue to use the java runner because it shouldn't be unnecessary.
Typical memory setting for the launcher for a 64bit system is 2048 max, 64 min, 3 stack. You shouldn't need to associate the java file in the launcher.