Thanks for that, Ricktendo. In my own attempts I had identified all of those, plus awaymode160.cat in the svcpack folder, but I thought if I left devcon it would be OK (isn't devcon just the cmd line equivalent of device mgr?). However, and the reason for my post, is a small issue: I do not see an autorun.inf in the unpacked addon nor a reference in the entries file. Isn't that a typo? Can't speak to the MCE-specific integration results yet. My modded and repacked addon hasn't been working for me, but every indication is that there is a problem with some other stuff I am adding. Should know soon enough. One issue for me has been to maintain a stellar .Net1.0 install (apparently important for MCE or TabletPC), get .Net1.1 installed at T-13 for this addon, and still add .Net2.0-3.5. Latest test shows that a hand-rolled .Net1.0SP3 plus the DotNetFx_All_In_1_Addon_v2.3.7z from RyanVM.net, installed in order at T-13, all show up fine in my VM tests. Using Aaron Stebner's .Net Verifier tool, one still gets missing file error flags for 3.0 and a couple of other SPs, since the XamlViewer files that 3.0 adds are uninstalled by later fixes or 3.5, don't remember which. I extracted these files from 3.0: XamlViewer_v0300.exe.manifest XamlViewer_v0300.xbap XamlViewer_v0300.exe and stuck them in $OEM$\$$\Microsoft.NET\Framework\v3.0\WPF just to see if that was the only issue. Sure enough, with that "cheat" the Verifier reports 100% OK on all frameworks after a fresh install (I am keeping the files there; hope that doesn't bite me later).