The issue seems fixed in Ubuntu 18.10
** Changed in: gtk+3.0 (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1451500
Title:
Can't set
** Package changed: nautilus (Ubuntu) => gtk+3.0 (Ubuntu)
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https://bugs.launchpad.net/bugs/1451500
Title:
Can't set any other program as default for *.m3u
To
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