if you want to keep it on your school pcs you can also rename the extension and it will still be runable. for example,
you have c:\game\abc.exe
rename it to abc.pexe
and then open your comand line
cd to the directory where the game is (cd c:\game)
and write ./abc.pexe
or just create a batch file inside the same directory with line ./abc.pexe
or a shortcut..
anything
of course, if the game is looking for more exe files you're screwed and have to play it off usb
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