What's a .TLB file?

What's a .TLB file?

I got oleguids.tlb, stdole32.tlb, msado20.tlb and so on.

Thanks

Type LiBrary file

It contains a set of types that allow you to get access to certain things.

For instance the Shelllnk.tlb contains a type that allows you to get the details out of a Shortcut file (*.lnk)

Look up those you have in MSDN and see what they say. Having them "Referenced" in your VB apps allows you access to their functions.