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I'm trying to assign some desktop files a wide range of mime types. In this case it would be useful if PCManFM would support wildcards for example "text/*=SciTE.desktop;" and "*=burn.desktop".
There is nothing in XDG specification that says it is possible to have wildcards. See the specification at http://www.freedesktop.org/wiki/Specifications/mime-actions-spec/ page. Therefore there is no way to have those wildcards in the mimeapps.list file. I'm sorry.
Some time ago I have made a report on the freedesktop.org bugtracker to get this changed in the XDG specifications: https://bugs.freedesktop.org/show_bug.cgi?id=68090
Maybe they will really change this at some point in the future.