Each application is developed in a unique way, and because of that, you have to follow its guidance when adding something. The same applies to the WightSoft Enterprise. You can't just paste an unlimited amount of data into a form that wasn't designed to hold that much. Like the software recommends, try pasting a limited amount of data into the file and it should work. I've searched on the web, but Google doesn't give anything important about the WeightSoft Enterprise and data pasting.