Cool. Yeah, there is nothing there. But I got a little further:
I ran this command:
openssl enc -d -p -aes-256-cbc -a -in Quark-wallet-keys-09-11-17 -out privatekeys.txt -pass pass:*********
and then I got values for:
SALT:XXXXXXXXXXXXXXXXXXXXXXXXXXXXX
KEY:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
IV:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
plus a whole lot of error messages and shit
but then when I try to load the importprivkey into the qt-client I get
Invalid private key encoding (code -5)