Although MASM 6.x has a 5.1 compatibility mode, MASM 5.1 may be required to assemble some picky sources. Or maybe some "collectors" are looking for it, who knows... ;)
Note: MASM is no longer sold by Microsoft, and the MASM executable and linker can be found in other tools available for free directly from Microsoft. Therefore, I am making it available for download here. If you represent Microsoft and want this download removed, please contact me.
