Compatibility Add-ins

“The ‘X’ Add-in is not a valid Office Add-in”: DLL registration fixes

The “The ‘X’ Add-in is not a valid Office Add-in” error prevents proprietary or third-party analytical…

COM Add-in Conflicts: How to identify which add-in is crashing Excel

COM add-in conflicts occur when an external compiled program (.dll) attempts to write to a memory…

Excel Add-in and Version Conflicts: Diagnostics for Ribbon and Compatibility Failures

When Excel features mysteriously vanish from the ribbon, or the application crashes upon interacting with an…