You use a very old DOS based program Mazak32.exe that you presume to have been written in Basic you would like to be able to open it and read its contents Can you do this and how?

You cannot read the contents of an EXE file (unless you are a computer, of course). There are some software programs, however, that can "reverse-engineer" software. That is, they can take the EXE and convert it back to the programming language it was created in.