Ml612.exe contains the files you need to update Microsoft Macro Assembler (MASM) from versions 6.11, 6.11a, and 6.11d to version 6.12. To use this update, you must have either MASM versions 6.11, 6.11a, or 6.11d currently installed. One or more of the following files are affected by this update depending on the version installed: Ml.exe, Ml.err, H2inc.exe, H2inc.err, Readme.txt, Errmsg.txt, or Support.txt. See the Readme.txt contained in this update for other information and installation instructions.