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If you are getting the following error on its own in a message box:

Exception from HRESULT: 0x80041001

Whilst trying to update your WCF service reference then it can't access either the .map file or the C# source file.  I happened to have them open in visual studio whilst trying to update the reference!!

Oddly if you open them after running the program then it doesn't moan...  For some reason I think it may be to do with clickonce locking the files.