Need help

I want to run several games off of my thumbdrive at school.
Unfortunately, most of them are copyright, so if someone were to upload a portable version, it would be piracy.
However, I know the directories they use.
I want to use a batch script to make them use a different directory, one stored on my jump drive, then turn THAT into an EXE so that the platform will detect it. I remember it being possible. Please help.