I added one SDK(.dll) to one project, through click righ -> add -> reference -> Browser -> look for the SDK in my local file explorer, then click Add and finnally Ok.
so, The question is that now I must add it but for a code directed for linux, I have the SDK for linux, its extension is .a
which is the way to add as a reference???, since the usual way only allows adding dll, tlb, olt, ocx, exe or manifest files