Compatibility with Older Versions 1. Compatibility with Older Versions .xlsm files are compatible with Excel versions from 2007 onwards, but it is recommended to check compatibility with older versions. 2. Converting from .xlsx to .xlsm You can convert an .xlsx file to .xlsm by opening it in Excel and saving it as an .xlsm file. 3. Best Practices It is recommended to back up your files regularly and take precautions to protect your macros and VBA code.