Vincenzo Russo 

Can you share the Excel file?

Also, the solution is to repair Microsoft Office so I doubt anyone is going to resolve anything here.

Sure! 

Here's the file. 

Glossary.xlsx

I also tried to repair Microsoft Office, but the issue is not resolved

Vincenzo Russo 

Thanks for your file.  I can reproduce the problem and I think I know the cause... it's OneDrive.  If I have the file here I get that message:

c:\Users\pfilkin\OneDrive - RWS\Documents\SDL\TESTING\Vincenzo Russo\Glossary.xlsx

If I have it here, then all is well:

c:\Users\pfilkin\Documents\MT Convert\Glossary.xlsx

I tried to making sure that the version in my One Drive folder was always available but that didn't help, the message is still there.  So the answer seems to be don't use any folders that are managed by OneDrive for these files.

I dont have the file managed by OneDrive. It's located in my PC. 

Vincenzo Russo 

This:

c:\Users\pfilkin\OneDrive - RWS\Documents\SDL\TESTING\Vincenzo Russo\Glossary.xlsx

Is on my PC too.

Vincenzo Russo 

Maybe you're using a Mac?  Similar issue I think.

Not using OneDrive and not using a Mac

Vincenzo Russo 

Then I have no idea... unless of course you are using a 64-bit version of Microsoft Office?  That could be the other reason.  If it's none of these things then I have no idea.  Maybe a good time to rethink the format of the file in Excel and redo it so the Glossary Converter can work with it more easily instead?

I’m using a 64-bit version of MS Office, since my computer is 64-bit