It took us a while, but we have uploaded instructions provided by a user on how to load QWI files in SPSS, including the relevant format file. While the user has successfully used this setup a number of times, your setup may be different and your mileage will vary... Registered users can find the file under http://www.vrdc.cornell.edu/qwipu/experimental/, other interested users can request an account by following instructions on our QWIPU description page.