From previous posts you may have read how I integrated the Microsoft BizTalk documenter into my MsBuild process.
In general this has been working fine, but every now and again I kept getting a build failure when trying to generate the documentation as follows:
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Documents and Settings\<UserAccount>\Local Settings\Temp\BTS2K4Doc\Application\fb7b6ba7-016c-4a1f-9c7d-ec9037911456.html'
If you get this it seems to be caused by an hhc.exe (Microsoft Help Compiler) process still being alive from a previous run. Just kill it and the builds will work again.