Caches and Crash Reports
D2X-XL 2.0 computes a lot of data when a level is loaded for the first time: the level mesh, light data, lightmaps, the light in fog, tessellation and reverberation.
All of it is kept in caches in the game's cache folder, so it doesn't have to be computed again the next time. Each cache file is checked against the level it belongs to and computed again when the level has changed. Compiled shaders are cached as well.
When D2X-XL crashes on Windows, it writes a crash report with the call stack and a minidump to the logs folder inside the cache folder. If you report a crash, please attach these files.