Cranky requested some comparison shots for this since the wiki page lacks any info and it says it's native. I can confirm that like Crysis, Warhead has native support for all single widescreen resolutions. Screen behavior is Hor+ with no anomalies recognized. I may get around to writing a DR for this one. I couldn't get faux multiscreen to work, so no ultra-wide shots.
UPDATE: Unfortunately I had a hard drive failure with surface damage in a RAID 0 array on my desktop. DR is going to have to wait until I buy a new HDD. I think I'm going to stick with Seagate from now on... and not do a RAID 0 again (drives were Western Digital, I was young and stupid when I did it).
1280x1024 (5:4)
1280x960 (4:3)
1440x900 (8:5)
1280x768 (5:3)
1600x900 (16:9)