When you double click XBM files on computer, the associated program will be launched to open the selected XBM file. But you can change it to any program at your pleasure.
a) Select a program to open XBM files on Windows
Right-click on the XBM file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the XBM file opener. If you decide to always open XBM files with the program, only check the option 'Always use the selected program to open this kind of file'.

b) Select another application to open XBM files on Mac
First Get Info about any one of XBM files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your XBM file. Click 'Change All' button to set the selected application as the default XBM file opener app.

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