2016-01-26, 14:42
Code:
<smartplaylist type="songs">
<name>Songs longer than 30 minutes</name>
<match>all</match>
<rule field="time" operator="greaterthan">
<value>30:00</value>
</rule>
</smartplaylist>
Put that in a text file, name it "songs longer than 30 minutes.xsp" and put in the userdata/playlist folder under music. It works for me.