Depending on the Windows version and whether using online or offline installer it seems to be impossible to use qdoc on Windows.
On Windows 7 you end up with a message box
(seems like qdoc was built on a later Windows version that does provide this lib by default)
Some installation end up with 'missing libclang.dll' (seems to be the case for 5.11.2 online installer - there qdoc is pretty small compared to 5.11.1 - about 1MB vs. ~42MB - so, probably dynamically linked)
Note: On Win7 I've got api-ms-win-core-sysinfo-l1-1-0.dll (all these libs have the 1-1-0 pattern while on Windows 10 they're all having 1-2-0).