.TLB File Extension
File Type 1VAX Text Library
What is a TLB file?
Contains a text-based library of information used by a VAX / VMS system
File Type 2OLE Type Library
.TLB File Association 2
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.