Sometimes you come across BizTalk Projects that have been checked into source control, but someone missed checking in the AssemblyInfo.cs file
When you let Visual Studio create a new one, it all builds fine, but when you try to deploy it, you get weird errors about not having permission to the DLL in your Local user profile.
Trying to manually add the DLL to BizTalk will complain that the DLL is associated with another Application.
Removing the resource and then manually adding seems to work, but then it doesn’t recognise it as a BizTalk Assembly, and your artifacts such as Orchestrations, Schemas and Maps will be missing.
To fix this you need the following line after the AssemblyFileVersion line.
[assembly: Microsoft.XLANGs.BaseTypes.BizTalkAssembly(typeof(Microsoft.BizTalk.XLANGs.BTXEngine.BTXService))]
BizTalk musings 