Maybe some outline/border could improve the icon. I don't know. Don't know the reason why the old icons had to be changed. (I think this has been discussed in another thread, maybe it has been reasoned there too.)
EDIT: This is the resoning by wbond:
The primary motivation for the various icon choices was to have a symbol that was abstract, but all visually distinct. Previously all of the icons used a similar page outline that made it difficult to scan for different file types. The new icons are crisper, eschew the paper outline, and should hopefully be fairly easy to distinguish without a detailed look.
Not sure if the crispyness and distinctiveness outweight the problems, though.