Hello Jacques CEREZO ,

Although the error is most definitely a 'run time' error and I think most likely to be caused by the MS Office application, we would need further information and the error stack please

What were you doing exactly when the problem arose? Which file type were you working on.

What happens if you rename the file and re-save this to your desktop and then open the file in Studio and immediately 'save target as'?

Are you able to do this- or does the same error appear?

Knowing which MS Office version/Operating System and which version of Studio are being used would also be helpful.