MASM 8.0 in Visual C++ EE 2005

I doubt the Express edition has the custom build rule to properly compile .asm.  When I use Project + Add Existing Item and pick a .asm file, I get a prompt to select the build rule and can choose the built-in one for ml.exe.  If you don't get this, you'll have to make your own or purchase the retail license.

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Hans Passant.