I already own another application that uses the “.MUS” file extension. How to avoid an extension conflict?
When installing the program, select a custom install, and in the next panel, edit the file extensions. Deselect “.MUS” and let “.MYR” selected. Once installed, run the program, then select “Configuration>Global settings”. In the “Save” tab, select “by default, propose the .myr extension instead of .mus”. Doing so, the program will use the “.MYR” extension only.