Do you see any error message when you load it with File -> Open?
You can check the security settings under
File -> Options -> Trust Center -> Trust Center Settings -> Add-Ins / Macro Settings.
Mine look like this – as long as you have ‘with notification’ you can use .xll add-ins.


-Govert
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That message indicates you are loading the 64-bit add-in into a 32-bit version of Excel, or vice versa.
You can check the bitness of Excel in the File -> Account -> About Excel page.
When you build your add-in, you typically get <MyProject>-AddIn.xll and <MyProject>-AddIn64.xll files for 32-bit and 64-bit Excel respectively.
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