This has been reported on many different distributions, it seems that since this change: https://cgit.freedesktop.org/xdg/shared-mime-info/commit/?id=2d385ff07eae60f9d92bf932ed7e95fa94dc276d Browsers like firefox and chromium are unable to play .swf videos but, instead, they try to download the file but, then, I cannot find any application ready to open them :/ You can see people are workarounding this issue reverting the change: https://superuser.com/questions/726789/flash-files-swf-prompts-for-download-instead-of-opening/783451#783451 https://bbs.archlinux.org/viewtopic.php?id=173295&p=2 https://ubuntuforums.org/showthread.php?t=2218732&page=2 But that doesn't seem really "clean" to me :/ Thanks a lot for your help
If your browser can't handle aliases, then they're the broken ones, sorry. Looks like the browser plugin expects an old mime-type, which the browser won't give it. The browser could lie to the plugin when it sees it supports an alias. In any case, not a problem with the definition. I suggest you file a bug against the separate browsers.
They are reported for a long time... but nothing is done on their side :( https://bugs.chromium.org/p/chromium/issues/detail?id=380347 https://bugzilla.mozilla.org/show_bug.cgi?id=1294930
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