I just did and guess what happened... yes! Steam deleted the whole demo!
So leave it and you'll be just fine.
EDIT: I deleted the "L4D Demo DS" via Steam (right click -> delete local content) and not by deleting the files!
I can smoothly run it on my P4 HT 3.0 GHz / 2GB RAM / X1600 Pro 256 MB
I pressed the recommended settings button, then turned up the resolution to 1280x1024; anisotropic = trilinear; v-sync off;
no problems with great amounts of zombies --> perfect :D
i am already pre-loading the demo, can't wait to play it, but i mustn't until monday, i need to get some reports finished first :(
i know that if i start playing it today, i won't stop...
OT:
it's still "Left for Death[...]" in my rss feed ;)
Ubisoft hates you!
In Febuary I contacted Ubisoft via their Solution Center and asked if "Beyond Good & Evil" will somewhen be available on Steam. (I contacted the german-speaking support) Their reply came very quick and was very short:
Means:
Just BGE will definitely not be available on...