The very early XGA 1.0 driverdisk offers windows 3.0 and windows 3.1 drivers.
The windows 3.0 driver works in 256colors, the hicolor-driver seems to be only 256colors...

my favorit dos imageviewer quickview 1.x does not support XGA, it requires "svgavesa" to be loaded (vesa-driver for xga)
but the colors are completly broken. Cshow 9.04 does support XGA but only XGA1 in 640x480 and 1024x768 and not 800x600 of XGA2.

The 8154/a Demo works in XGA mode but does require the loaded xga-driver which consumes lot's of low memory.

Doc

I'll check these versions of cshow http://www.cshowplace.com/index.html

cshow2 does work but only 640x480 16/256/64k colors, 800x600 and 1024x768 do not work, they switch the TFT to false timings and ignore the monitor dsg file regardless if the xga-dos-driver is loaded. If I want to view images in 800x600 up to 64K colors or 1024x768 up to 256colors I have to use cshow for windows. Because the UI is not so nice and it's slow I will try other images viewer for windows 3.0 and 3.1. Would be interesting how the OS/2 2.1 and 3.0 software works with XGA. If have a feeling that on that OS XGA is much better supported...we will see...

I'll have a few image tools for Windows 3, some are free and 8086/286 compatible.
I'll see if I can find them..

PS: Didn't Windows 3.1 have XGA drivers built-in? If so, do they work?

The ancient PS/2 monitors aren't multisync, but support two resolutions.

640x480 60Hz (progressive)
1024x768 43,5 Hz (interlaced)

Both are supported/used by the 8514/A, too.

OS/2 2.1 offers XGA drivers but not XGA2. The XGA2 are only offered with WARP3.

If I choose XGA on OS2 2.1 I can't see an image on screen because it uses false values for my tft.
The Monitor-Files are copied to hard disk, where can I change the monitor from the false one to "monitor5555" which is VESA 14".
I had to go for "setvga" from boot floppy in order to see an image again. I browsed to folders and the files but I can't find the switch to change the monitor file.

Doc