VSTO Addins break after Visual Studio 2010 SP1 install, can't find config file
I ran into a breaking change with Visual Studio 2010 SP1 and VSTO at a client today. It seems there was a change that caused Office addins to look for their config files in the application’s folder instead of from the addin’s folder (e.g. Word.exe.config or Excel.exe.config). The result is all sorts of chaos with AppSettings, WCF service bindings and anything else that needs to be read from the app.config The details are posted here on connect - Visual Studio SP1 (or specifically VSTO
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Read the complete post at http://ericphan.info/blog/2011/4/11/vsto-addins-break-after-visual-studio-2010-sp1-install-cant.html