On MIME types and installation workflow

[nanotyrannus]

Hi, new user here. I noticed while installing the Obsidian AppImage that it has the mime type of application/x-executable, a non-standard mime type. I checked against the specification and found that there does not seem to be an official mime type for AppImage at all! Please correct me if I'm wrong.

It appears that currently AppManager recognizes application/vnd.appimage and application/x-iso9660-appimage. ISO 9660 appears to be about optical disks and is potentially misapplied here, and by other AppImage developers. What do you think about adding a new workflow to catch exotic mime types? They may appear from time to time, unless and until the AppImage spec implements an official one and the ecosystem catches up to it.

I propose any of the following:

1. The existing dropdown menu to have an "Install from..." file modal dialog option.
2. An "Install AppImage" button above the list of installed AppImages, which opens a file modal.
3. The ability to drag and drop directly onto the window.

Thoughts?