what does these command output for you?
$ xdg-mime query filetype
/usr/share/themes/Ambiance/metacity-1/close_focused_normal.png
$ xdg-mime query filetype /usr/share/themes/Ambiance/metacity-1/close.png
over here it says "image/png"
/usr/share/mime/packages/subtitlecomposer.xml contains this:
<mime-type type="text/x-tmplayer">
<comment>TMPlayer subtitles</comment>
<sub-class-of type="text/plain"/>
<generic-icon name="text-x-generic"/>
<magic priority="100">
<match type="string" value="xx\:xx\:xx\:"
mask="0x0000ff0000ff0000ff" offset="0"/>
<match type="string" value="xx\:xx\:xx\:"
mask="0x0000ff0000ff0000ff" offset="9:256"/>
</magic>
<glob pattern="*.sub"/>
</mime-type>
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https://bugs.launchpad.net/bugs/993275
Title:
installing subtitlecomposer breaks Ambiance theme window decoration
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