How to Open an XLSM File. An XLSM file is a spreadsheet that contains macros written in the Visual Basic for Applications, or VBA, language. Macros enable you to automate repetitive tasks and save ...

Firstly, click on the File menu and choose the Open option. Next, tap on the Browse button and select the problematic Excel workbook. After that, click on the small down arrow icon which is ...

If Excel Online is not working and you see errors Couldn't Open the Workbook, or Request Was Taking Too Long, then see this post for the fix.