Hard to say without knowing what is in the file....is it a single sheet file?
Not sure if it could be a limitation on the number of entities in a single 2D file.....but 200MB does sound like a massive file. I have a few 20 sheet draft files with many views & individual components for large assemblies, and those only get half of what you're seeing. Sounds like a cleanup is probably in order.
Sean Cresswell Design Manager Streetscape Ltd Solid Edge ST10 [MP8] Classic [x2 seats] Windows 10 - Quadro P2000