It uses TlbInf32.dll which ships with Microsoft Visual Studio. Check if you've this DLL in the windows system directory.

>It fails at the following line:
>THIS.oTLIApp = CREATEOBJECT(TLIAPP_PROGID)
>What am I missing?
>
>>>I am trying to use:
>>>DO FORM "c:\program files\microsoft visual foxpro 8\samples\solution\winapi\typelib.scx"
>>>to view a tlb file. As soon as I say view it crashes. Is it known bug?
>>
>>It works for me w/o problem. All the source code for it is available so you can trace where error occurs.