I suspect that the fact that the zip file contains an executable may be the issue here. People are rightly scared of the security risk of CHM files containing executable code. So much so that Microsoft have release numerous security updates. You may be better placing the zip files on a website/server and linking to them there.
Colum may be spot on, but in case that isn't quite it, you may wish to change the file name so that instead of this:
Media Manager Demo 188.8.131.52.zip
It's something like this:
Note that each space now has an underscore as well as each of the dots having underscores.
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Rick and Colum, thanks for your quick replies.
The underscores in the name didn't work. I decided to attach the .exe and .msi files seperately instead of in a zip to see if I could narrow down the issue to the zip containing an .exe or if it's one of the two files alone. Come to find out it's the .msi file that's the problem. The .exe is fine and can be saved to the PC or LAN. The .msi file isn't compiling. For now I'm just going to link the user back to our website that has the program they need to run. The person using this .chm may not have Internet access so I was trying to avoid that. They'll just have to install the program in question beforehand. In the meantime any word on .msi incompatibility with .chm?