— This may have multiple causes like large files, spending time on validation...

— Open the Excel application, go to Options > Advanced > General > Clear...

— It seems like there may be an issue with the Excel file or how the program is...

— If the password is known, Recovery for Excel application has the ability to...

— I understood your question a little bit... Try uninstalling VLC. Download a...

— Yes, you can export a multi-sheet Excel file to CSV using the built-in menu...