yea id try looking in the folder for sure,
see if they are there 1st and then just make a shortcut and cut steam out of it
if its steam thats the issue, post a ticket to them
ive never seen this issue before but to play the game you can set the -offline and see if it finds them,
or try disabling cloud, in case its trying to set files that werent apart of steam (my clouds are ALWAYS disabled)
not sure thats the issue here though, but yea check the folder if you need the app id or something to find the folder let the forum know,
try the exe's in the folder if they work without steam launching its bootstrap its steam for shizzle