We are developing BizTalk applications with Visual Studio Team Edition and every now and then for some reason the Orchestration Designer is removed from the "Open With" dialog, thus when one double clicks on an orchestration it is opened with the Xml Editor. Although I'm not sure why this happens, I suspected the items in this dialog were configured in the Windows Registry ... and so they were, so to fix:
1) Open RegEdit
2) Go to HKEY_LOCAL_MACHINE\Software\Microsoft\VisualStudio\8.0\Editors and find the BizTalk Orchestration Designer for us it was under Guid {679b7fd6-2104-42b2-8d87-86dd575fc269}
3) Get the package key Guid, for us this was {2f926337-2bfb-46ab-bbc4-a955ce25ff6f}
4) Go to HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\Packages\{Package Key Guid}\SkipLoading
5) Set the SkipLoading key to 0
6) Restart Visual Studio and the Orchestration Designer should show up in the "Open With" list
Does anyone know why the SkipLoading key is mysterously turned on for the Orchestration Designer?