I mentioned a problem with 64bit Powershell in my previous post: 3 snap-ins I've wanted to use have been packed for 32 bit and didn't work "out of the box" on 64 bit, so I thought I'd give a generic guide to making snapins work on 64bit.
I got an error that the WindowsMobile provider could not find WindowsMobile.formats.ps1xml in the FormatData folder , so I made the folder and copied the file into it. I think the set-up configures one folder and the command line assumes another.
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Thanks James for the notes on the 64bit problems. I have no access to a 64bit platform to test here, but I've doing a bit of research and it looks like the only way to do it with WiX (what I'm using) is to create a separate 64bit installer. The WiX stuff is pretty closed, especially the powershell extension that I'm using.