Jumpnett's got(?) Masm sourcecode, and wants to know if Nasm will assemble it (if I understand the question). I fail to see how "objcopy", all of "binutils", or even Agner's wonderful "objconv" are really going to help him...
What one would want, I would think, would be a Masm-to-Nasm source code converter. A long time ago, I was trying to translate code from the old 16-bit "Art of Assembly" into Nasm syntax. I used a Perl script someone gave me, a "search and replace" utility (translated to Nasm's syntax from Herbert Kleebaur's "Daniella" assembler, if you're familiar with *that*...), wrapped up in a batch file, which kinda sorta almost did the job.
I might still be able to find a "beta test" ("gamma", maybe) version of a converter someone sent me... It, too, worked... pretty good most of the time... I don't think I was supposed to redistribute it... But my memory's failing pretty bad...
But the short answer is "No.", Nasm won't assemble code written for Masm. It can be "translated, if that's what you want to do...
Best,
Frank