modification of GUI for 16-Bit Program

Dear All;
This is the first time for me here in this forum and your help is urgently required..
in the attached 16Bit-program (Turbo C++) I would like to make modification in user interface so I can disable the browsing option in file menu -- open windows, cuz I am using this software for my students and I have applied group policy for restericting drive access for exams, but cuz turbo C is 16 bit application so they can brows the hard drive through open menu, so the best solution is disabling this menu..
sorry for my english

Note: the exec file is TC.exe inside Bin folder