Don't use "web:TextToHTML" for XML escaping... use "web:TextToXML" instead. TextToHTM...

[vuplus_dvbapp-plugin] / webinterface / src / web / mediaplayerremove.xml

<e2:screen name="MediaPlayerWebScreen">&lt;?xml version="1.0" encoding="UTF-8"?>
<e2:element source="RemoveFile" id="file"><e2:convert type="web:Null" /></e2:element>
<e2simplexmlresult>     
        <e2state><e2:element source="RemoveFile"><e2:convert type="SimpleResult">Result</e2:convert><e2:convert type="web:TextToXML" /></e2:element></e2state>
        <e2statetext><e2:element source="RemoveFile"><e2:convert type="SimpleResult">ResultText</e2:convert><e2:convert type="web:TextToXML" /></e2:element></e2statetext>      
</e2simplexmlresult>
</e2:screen>