Thanks for posting. I think most of those games can be run using DOSBox or another emulation program, though they won't work natively.
Arthur's Knights is probably the hardest to get working. I'm pretty sure it requires a 3D video card, so it probably won't run in Virtual PC. It might run in VMware or VirtualBox because they're supposed to have some 3D support. Or you could try running
***3D-Analyze*** inside the Virtual Machine.
Backpacker, Blown Away, Dark Eye, Fox Hunt, Quest for Karma, Robot City, Victor Vector, and Woodruff and the Schnibble probably all have 16-bit code since they were first published around 1995 or earlier and list Windows 3.1 compatibility. Woodruff and the Schnibble is listed on the DOSBox site as supported, though it may be easier to play it in ScummVM. The others should work inside Virtual PC with Windows 95 or 98 installed. Since they are Windows 3.1 compatible, they might also work in DOSBox with Windows 3.1 installed. (I haven't tried installing Windows 3.1 in DOSBox, though I believe Inland has.)
Crystal Key may have a QuickTime issue. Crystal Key came out in various versions, and the earliest ones needed patches. I think the later ones were updated with more recent versions of QuickTime. One of the early versions had an installation problem where the QuickTime install would overwrite part of the game, so you had to be sure to install the game after installing QuickTime.
Besides having 16-bit code, Ark of Time has a VESA problem with newer video cards. Many games from around 1995 used undocumented features of VESA modes that were common around that time. They did this to make the graphics look better. Of course once VESA was updated from version 2, it only supported the documented features of version 2, and new video cards only supported the later VESA. Ark of Time may also have a problem with newer sound cards. The easiest way around all three problems is to play the game in DOSBox.
Discworld 2 is another one that's listed as supported in DOSBox. I think it may have had the VESA problem too. (maybe someone else can remember)
Gene Machine lists "VESA-compliant" right on the box -- and of course it would be the old VESA it needs. Another one for DOSBox.
All the Leisure Suit Larry's are supported by DOSBox.
Legend of the Prophet and Timelapse are worth trying in Virtual PC. I don't think Legend of the Prophet requires 3D accelerated graphics and I know Timelapse doesn't.
Morpheus and Opera Fatal use old versions of QuickTime and may contain 16-bit code. Both should work in Virtual PC with a Windows 95 or 98 VM.
Toonstruck is supported by DOSBox.
So the only one of the above games that may be impossible is Arthur's Knights, though the others won't run natively and using VirtualPC will require a Windows 95 or 98 install CD.
Congratulations on getting GAG, Louvre, and Salammbo running. Those can be added to the compatible list.
By the way, if you've tried some of these that DOSBox claims are supported and they haven't worked, let us know that too.