I'm the designer/cartographer Madmax is referring too - from a thread he started at the Cartographers' Guild. I pointed him to XP&GD9, he downloaded it, started using it, and then sent me a flood of questions. Most of which I could answer, until this question... and I had no idea, as it never happened to me. It was hard to guess at a solution without seeing what actually happened to the file.

Welcome MadMax to the Talkgraphics forum!