Opening compressed file attachments from GMail using Total Commander
The Total Commander app can only work with saved ZIP files. This is defined in it's AndroidManifest.xml:

&lt;intent-filter&gt;
    &lt;action android:name="android.intent.action.VIEW"/&gt;
    &lt;data android:mimeType="application/zip" android:scheme="file"/&gt;
    &lt;category android:name="android.intent.category.DEFAULT"/&gt;
&lt;/intent-filter&gt;


As you can see there is only an entry for the file scheme, but no for the content scheme.

On Android users can not modify which app can handle what file format. Hence without a change by the author of Total Commands you can't do change this behavior on an unrooted device.