If it is the same site - i.e. you are upgrading Site A from 3.4.9 to 3.7.1 - you don't have to export/import the settings, they are stored in the DB and will be used in 3.7.1
If you want to go from 3.4.9 on Site A to 3.7.1 on Site B - an easy thing to do is a manual install
of 3.7.1 on Site A and temporally swap to 3.7.1, do the export, swap Site A back to 3.4.9 and then import the settings into Site B
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Juggledad | Forum Moderator/Support