VS2022 Default #include folders

[John E]

I'm sure there's a setup window somewhere that'll allow me to add a folder to the VC compiler's list of default #include folders. I'm not talking about adding folders for a particular project - but a window which shows VC++'s own default folders and allows me to add some extra folder that'll then apply to all my projects.

But for the life of me I can never find that window! Can anyone remind me where it is?

Also... what are the files having an extension of .exp? One of my builds here is complaining it contains missing symbols but the .exp file itself is around 2 months old. How do I make VS2022 rebuild it? (clean and rebuild don't seem to re-generate it)