Does Knit Design Studio allow you to convert PAT files into CUT or BMP?
The application doesn't seem to have the capability that you're looking for. As far as I can see it can open or create files in the KDS format and the Export to image functionality will only create JPEG files.
In case you need additional information or would like to ask the Knit Design Studio's developer to introduce the functionality that you're looking for, you should visit this web page: http://savannahwinds.weebly.com/knit-design-studio.html and use the form at the bottom of the page.