Cannot open pak file, cannot launch game

[[SOE]No.Mam]

possible steam didnt download e1.pak correctly.
delete & download game new again.

...or possible same problem as with MoW:AS and Steam

Q: The game crashes on start up saying it can't open a file, what can I do?
A: Your download isn't entirely finished. Go to your Steam Library, left click on MoW:AS - preferences, local files, synchronize integrity of game cache. After that Steam will download all unfinished files.