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So, for uncompressed PS I have "100915.12756d5.ps.xml" with '<documentInfo url="/home/rik/12756d5.ps">'. While for .ps.gz several "100915.okularBw4353.tmp.xml", "100915.okularkm4353.tmp.xml" and alike, which all have '<documentInfo url="/home/rik/12756d5.ps.gz">', but every time I open the document another xml appears and gets used.

Same thing happens if you try to open/annotate .pdf.gz, probably other compressed files.