Linux Dungeons and Dragons Online – How to Fix Game Opening in 800×600 Resolution

I've installed DDO (Dungeons & Dragons Online) on Linux (Ubuntu 16.04) using wine. The launcher runs fine, and the client itself runs but is stuck in 800×600 resolution. This isn't even enough room for me to click on any buttons, let alone get into the graphics options and fix the resolution.

Is there somewhere, either in wine config, in the launcher, or in UserPreferences.ini, that I can fix the screen resolution to something usable? (My monitor is 1920×1080.)