This is caused by the MIME type definition for application/x-glade in /usr/share/mime/packages/freedesktop.org.xml (package shared-mime-info):
<magic priority="50"> <match value="<glade-interface" type="string" offset="0:256"/> <match value="gtk" type="string" offset="0:256"/> </magic>
This means that every file that has the string "gtk" in its first 256 bytes has the MIME type application/x-glade - which is a bit too general.
This is caused by the MIME type definition for application/x-glade in /usr/share/ mime/packages/ freedesktop. org.xml (package shared-mime-info):
<magic priority="50"> <glade- interface" type="string" offset="0:256"/>
<match value="
<match value="gtk" type="string" offset="0:256"/>
</magic>
This means that every file that has the string "gtk" in its first 256 bytes has the MIME type application/x-glade - which is a bit too general.