Tlb extension is related to Type Library. You can open tlb files by using ole supported softwares.

Tlb files include user interface informations which used by various softwares. Here is the some softwares which support Ole: 

Spss analysis software:

Borland products:

Visual C++ programming:

Besides, you can check these web pages for getting detailed information. 

What to use TLB

OLE supported softwares

which page related to TLB file

TLB Related Searches

You can check related links about TLB fileextension.