Sims2Skin
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First there is some header info...
18 - Header (Sims2 Packager 1.0) 4 - Data Offset
Then comes the XML data...
<?xml version="1.0" encoding="UTF-8"?> <Sims2Package type="assets">
<PackagedFile> <Name>starter.package</Name> <Length>8903470</Length> <Type>part</Type> <Offset>0</Offset> <Description>Something here</Description> </PackagedFile>
</Sims2Package>
Following this comes the file data according to the offset and size info in the XML header. Also, the offset is relative to the end of the XML data.
There are two possible Types, part and sim, however, I don't know what's the difference.
Obviously the "start/stop repeatable" tags don't appear in the file, thats just for your benefit.