For Microsoft icons the real mime-type is image/vnd.microsoft.icon as registered at IANA[1]. And I also think "Microsoft icon" is a better description than "ICO icon" since ICO is just short for icon to begin with and doesn't really give any extra information. Besides that it's not uncommon for other (now forgotten?) icon formats to also use the extension "ico". Further more it isn't entirely correct to call it a "windows icon" since it's usage is "favicons" for webpages as well as use "within a GUI environment" according Microsofts registration of the type at IANA. Also according the registration at IANA the format has more aliases. They are incorrect and even stupid, but apparerntly they are used. [1] http://www.iana.org/assignments/media-types/image/vnd.microsoft.icon
Created attachment 22834 [details] [review] ...and the patch
* freedesktop.org.xml.in: Patch from Magnus Bergman to make the Windows icon match its IANA definition (Closes: #20069) * tests/list: Fix mime-type for the above
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