hypothesis:
Removes the model item index from the file system model and deletes the corresponding file from the file system
It sounds like they selected "local file system" is a navigator there - what if that corresponds to a file path of /
?
<name>Firebolt</name>
<set picURL="C:\Users\Documents\Aethershaper\Cards/Firebolt.full.jpg" picURLHq="" picURLSt="">ATR</set>
<color>RR</color>
<manacost>3</manacost>
<cmc></cmc>
<type>Instantaneous - Evocation, Beast Essence</type>
<pt></pt>
<text>Deal 3 damage to the lane.</text>
</card>
<card>
<name>Blaze</name>
<set picURL="C:\Users\Documents\Aethershaper\Cards/Blaze.full.jpg" picURLHq="" picURLSt="">ATR</set>
<color>RR</color>
<manacost>4</manacost>
<cmc></cmc>
<type>Instantaneous - Conjuration, Fire</type>
<pt></pt>
<text>Deal 2 damage to all enemy creatures. Burn 1 all creatures damaged by this spell.</text>
</card>
<card>
<name>Lightning Strike</name>
<set picURL="C:\Users\Documents\Aethershaper\Cards/Lightning Strike.full.jpg" picURLHq="" picURLSt="">ATR</set>
<color>RR</color>
<manacost>4</manacost>
<cmc></cmc>
<type>Instantaneous - Evocation, Lightning</type>
<pt></pt>
<text>Deal 2 damage to your opponent.</text>
</card>