So nowadays, all the different DLL versions are kept in parallel under WinSXS, sacrificing disk space for improved system reliability. In the past a single DLL was shared among many programs, but a "DLL hell" ensued because different programs required different versions of the same DLL. WinSXS is a folder for side-by-side components, that is DLLs and other files that various programs need to run. What is this folder, why is it so big and can we do anything about it? The biggest item is that WinSXS folder taking up 11.3 GB(!) on my win7 system, around a third of the windows total size (it is much worse on 64 bit windows). You can see how this space under C:\WINDOWS folder is occupied using xplorer² Tools > Folder statistics menu command (see pic). How many floppy disks would you need to store a full windows installation nowadays? Around 21,547 1.44MB floppies - a long way from the 6 disks required for windows 3.1.
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