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file format and extension of "XLLAddin.xll" don't match
I have Visual Studio 2012.
I run setup.msi and project2010.msi .
All installs ok and builds ok.
But the XLL that gets generated is not recognized by Excel 2013 with the error : "The file format and extension of "XLLAddin.xll" don't match"
Any suggestions on what i might be doing wrong here?