windows - Rmdir/rd access is denied (Corrupted folder)

I have a corrupted folder, I don't really know how it got that way. When I use rmdir in cmd as administrator, I get this:

C:\WINDOWS\system32>rd "\\.\\C:\Program Files\Steam\steamapps\downloading\730" /s /q
\\.\\C:\Program Files\Steam\steamapps\downloading\730\bin\locales - Access is denied.

With a lot more lines of access denied. I can't "get permissions" with ownership as it gives me the same error. I tried rd without the \\.\\ part and it doesn't work either. What can I do ?