Save current file in binary format To save the current spreadsheet in binary to save space, use these steps: Open Microsoft Excel. Open a spreadsheet. Click on File. Click on Save As.

Open source collaboration software vendor Open-Xchange has added a spreadsheet function to its open-source, web-based productivity suite, allowing the online editing and sharing of Microsoft Excel ...

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

I finally found the perfect open-source spreadsheet tool, and it does Python better, too ...