view diff is broken?

[Michael Heidemann]

Thanks Steffen, that should exactly be what I need. But now I see that in Thunderbird x-ldraw is already set.
<RDFescription RDF:about="urn:mimetype:externalApplication:application/x-ldraw"
NC:prettyName="LDView.exe"
NC:path="E:\LDraw\Apps\LDview\LDView.exe" />

But this is not shown in Firefox!?

Because it seems to work for your in Firefox as well, can you please share your entry, so I do not need to read through all that stuff ?

Just found a second entry:
<RDFescription RDF:about="urn:mimetype:handler:application/x-ldraw"
NC:handleInternal="false"
NC:alwaysAsk="false"
NC:useSystemDefault="false"
NCaveToDisk="true">
<NC:externalApplication RDF:resource="urn:mimetype:externalApplication:application/x-ldraw"/>
</RDFescription>