According to this you can use launch options to force certain resolution. Works for my 1920x1200.
https://talk.turtlerockstudios.com/t/pc-config-file-location/26831
Just right click the game in steam library > Properties > Set Launch Options... > paste this (adjust accordingly):
+r ...
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- 18 Jan 2015, 12:41
- Forum: Request/Discuss Game Solutions
- Topic: Evolve Big Alpha
- Replies: 23
- Views: 18912