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I had a program installed on my Kubuntu system that was able to open a lot of different graphics file types and registered as default program for many of those file types. I have unistalled the program, but in the file associations it is still present and every now and then as I try to open a file from the file manager, it tries to launch the no longer existing program.

I could remove that association for the most often used file types via the file associations dialogue in KDE's settings menu. Unfortunately, in this dialog I can only search for a file type and see/edit the associated programs, but in this case, I would need to search for the program and see all file types that it is associated to.

Is there a way to achieve this? If not via the settings, maybe in some config file, where I can just remove all hints to that program?

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KDE uses freedesktop.org's standard mimeapps.list files for associating MIME types (file types) to applications.

The lookup order for this file is as follows:

  • $XDG_CONFIG_HOME/$desktop-mimeapps.list
    • user overrides, desktop-specific (for advanced users)
  • $XDG_CONFIG_HOME/mimeapps.list
    • user overrides (recommended location for user configuration GUIs)
  • $XDG_CONFIG_DIRS/$desktop-mimeapps.list
    • sysadmin and ISV overrides, desktop-specific
  • $XDG_CONFIG_DIRS/mimeapps.list
    • sysadmin and ISV overrides
  • $XDG_DATA_HOME/applications/$desktop-mimeapps.list
    • for completeness, deprecated, desktop-specific
  • $XDG_DATA_HOME/applications/mimeapps.list
    • for compatibility, deprecated
  • $XDG_DATA_DIRS/applications/$desktop-mimeapps.list
    • distribution-provided defaults, desktop-specific
  • $XDG_DATA_DIRS/applications/mimeapps.list
    • distribution-provided defaults

In this table, $desktop is one of the names of the current desktop, lowercase (for instance, kde, gnome, xfce, etc.)

This is determined from taking the ascii-lowercase form of a component the environment variable $XDG_CURRENT_DESKTOP, which is a colon-separated list of names that the current desktop is known as.

Note that:

$XDG_DATA_HOME defines the base directory relative to which user specific data files should be stored. If $XDG_DATA_HOME is either not set or empty, a default equal to $HOME/.local/share should be used.

$XDG_CONFIG_HOME defines the base directory relative to which user specific configuration files should be stored. If $XDG_CONFIG_HOME is either not set or empty, a default equal to $HOME/.config should be used.

These are plaintext, ini-style files that can be searched for a program of interest.

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