ILTTexInterface Where can I find the class?

The name shown on CE is
0051C9D0 - 55 - push ebp
0051C9D1 - 8B EC - mov ebp,esp
0051C9D3 - 51 - push ecx
0051C9D4 - 89 4D FC - mov [ebp-04],ecx
0051C9D7 - B8 3C437E00 - mov eax,007E433C { ("CSysTexInterface") }← this
0051C9DC - 8B E5 - mov esp,ebp
0051C9DE - 5D - pop ebp
0051C9DF - C3 - ret

This is commonly the first function in most lithtech vtables, which returns the class name. You can use IDA's xrefs to find the class constructor and find the global variable associated to it.