Ssteam (shitty steam) stores saved games in CLOUD. With some effort and guidance, you can track down the files with saved data in YOUR machine, but both their location (folder structure/path) and their type are different and a total mess/chaos. Why good man, the witcher, on steam? The company that created, owns GoG... And it gives it both DRM Free and accompanied by a large digital bag FULL of digital extras, making it a collector's edition of sorts...
Best bet is to open a thread in Steam, asking steam the Witcher players there where (IF) you can get to your saved game in your own machine. And, if you wish to buy 3, by the powers and all gods, prefer GoG, here...
Post edited September 22, 2014 by KiNgBrAdLeY7