With earlier version of QGIS (1.8) it was possible to load data in Interlis 1 format directly.
If I try now it says something like unknown format. Is this because I'm using the 64Bit version of the installer?
A possible workaround could be using the examples at http://giswiki.hsr.ch/HowTo_OGR2OGR "interlis to shp".
It would be very nice to be able to open Interlis Files directly again.