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.

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: ...

Learn how to use a Microsoft 365 setting to choose whether to open files in the online or desktop app, giving you full control for each file.