Also, check the size of the file. If it is too large, split it into smaller files. If you still get the error, use these solutions to fix Excel Online is not working and won’t open files: ...

If you open the file online, Microsoft 365 will open it on the desktop by default, so you can skip the manual process without worry. To set this default setting, follow these steps.

If you are wondering how to open SDR files on Windows 11/10, you can either use the parent tool, SmartDraw, or use an online tool or program.