diff --git a/assets/mimetype/xps.xml b/assets/mimetype/xps.xml
index 2b6e0292..0d3677cf 100644
--- a/assets/mimetype/xps.xml
+++ b/assets/mimetype/xps.xml
@@ -7,13 +7,8 @@
     <comment xml:lang="en">XPS Document</comment>
     <acronym>XPS</acronym>
     <expanded-acronym>XML Paper Specification</expanded-acronym>
-    <sub-class-of type="application/zip"/>
     <generic-icon name="x-office-document"/>
     <glob pattern="*.xps"/>
-    <magic priority="80">
-      <match type="string" value="PK" offset="0"/>
-      <match type="string" value="[Content_Types].xml" offset="30:1000"/>
-    </magic>
     <alias type="application/vnd.ms-xpsdocument"/>
     <alias type="application/xps"/>
   </mime-type>
@@ -25,13 +20,8 @@
     <comment xml:lang="en">OpenXPS Document</comment>
     <acronym>OpenXPS</acronym>
     <expanded-acronym>Open XML Paper Specification</expanded-acronym>
-    <sub-class-of type="application/zip"/>
     <generic-icon name="x-office-document"/>
     <glob pattern="*.oxps"/>
-    <magic priority="60">
-      <match type="string" value="PK" offset="0"/>
-      <match type="string" value="[Content_Types].xml" offset="30:1000"/>
-    </magic>
   </mime-type>
 </mime-info>