Anyone know if there is a version of asm51.exe (or something similar) that will work with windows 7 64 bit?
(no C compilers please, I only use assembly)
I can not understand your question properly. If you want assembly language programming software then download keil C and bascom 8051 software from their official site.
I didn't know that programming software was different for assembly, or C, or Bascom or whatever.
I am not looking for programming software.
I am looking for a version of asm51.exe or something similar ("something similar" meaning that I won't have to change my source code in order to assemble it)
OR a way to run the very, very old program in a 64 bit windows environment.
Again, I AM NOT LOOKING FOR A C COMPILER or BASCOM OR ANYTHING ELSE.