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I did a clean install of Windows 10 on my workstation less than a month ago and my Windows directory is sitting at 23GB, methinks something funky is going on here.

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Do you have a bunch of applications installed? IIUC, Windows keeps different versions of each of its DLLs around for whatever apps requires them. I would expect that installing applications might embiggen your Windows directly a lot.

I wouldn't say I have "a lot" of applications installed, although I'm not too sure how to quantify that.

I assumed it WinSxS related as the other reply mentions, and upon investigation found that it is 9GB alone! I don't run Windows outside of work so I've just never really bothered looking into it, but if it continues to balloon I guess I'll have to.

It's probably due to WoW64 and WinSxS inflating due to dll caching and backup resources after Windows Update.

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