The proposal is an extension to the desktop entry spec, which would allow for an external program mark itself to be called when a thumbnail is needed.Things needed: A different type of say thumbnailer. An Exec that has the file to be thumbnailed as the %u or %U if there are many. A way to disable a thumbnailer this could be done by having a downstream desktop entry have Disabled=true
The thumbnailer would add a thumbnail using https://www.freedesktop.org/wiki/Specifications/thumbnails/ to the cache and then loaded
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Description: application/pgp-keys
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Description: OpenPGP digital signature
