tlb is: 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:
Visual C++ programming:
Besides, you can check these web pages for getting detailed information.
Tlb File format viewers or openers
OLE supported softwares
Tlb File related links.