There are 2 file types use the .TLB file extension:
1. VAX Text Library
Contains a text-based library of information used by a VAX / VMS system
Updated: May 27, 2021
2. OLE Type Library
Contains user interface data for programs that support Microsoft Object Linking and Embedding (OLE); generated by Visual Basic when an OLE or ActiveX server is created and the "Remote Server Support Files" option is selected.
NOTE: The file stdole3.tlb my contain a Trojan virus, so it should not be opened.
Updated: September 20, 2009