https://bugs.winehq.org/show_bug.cgi?id=44375
--- Comment #14 from Manoa jhopper@safe-mail.net --- I've just tested 5.1, one word: KING !!! not only I was able to load just as many mods as I could in windows but L4D2 also survived the loading of the next level in the map (with some slight cosmetic problems which is something that I could optimize later with smaller libraries), the next map loading process of L4D2 is usually the point of failure on windows as the vpk files being unpacked it takes address space during the map loading stage.
I've been waiting many years for this...