One of my colleagues recently encountered an error trying to open an Excel workbook on Sharepoint via the "Open in Desktop App" button. The screenshot of the error is below:

The error wasn't triggered when starting Excel normally, nor opening the same spreadsheet from OneDrive Desktop.

Upon Googling, I found results offering the direct download of this DLL, but I am not downloading DLLs from unknown sources! Other search results relate to gaming. One of the results suggested repairing Visual C++, but that didn't help.

Frustrated, I tried to repair and update a few Microsoft software. It was finally fixed by repairing Microsoft Office.

Lesson Learned

In conclusion, if I tried the fix suggested by the error message before searching the web for solutions, I would have saved time and frustration.

Extended reading

https://www.reddit.com/r/Xcom/comments/osgaal/msvcp140_atomic_waitdll_was_not_found/