Microsoft Access can be used to edit questionnaire files in place of the MediaLab editor. It can help in cases where you are experiencing trouble with cutting and pasting for example. Here is the blurb on it from the MediaLab user's guide:
Questionnaire (.que) and Experiment (.exp) files are really just small Access database files. If you right click on any questionnaire or experiment file and select Open With, you can choose Microsoft Access if you have it installed (you may have to browse for it). If you do this you may be informed that you can not make changes to database objects. That's ok. You may also be asked if you want to convert the database to a more recent version--just say no, and ask to open the file. Once the file is open in Access, you can double click on Table1 to edit the file. This allows you to bypass the MediaLab Experiment Editor completely or you can do some of the work in Access and some of the work in the MediaLab editor. Some people, e.g., like to load their files into Access for heavy copying and pasting jobs, or to use the Access Spell Checker.