/tlb switch
The /tlb switch specifies a file name for the type library generated by the MIDL compiler.
midl /tlb filename
-
filename
-
Specifies the name of the output type library (TLB) file. By default, if the /tlb switch is not used, the TLB file has the same name as the IDL file, with the extension .TLB.
midl /tlb newname.tlb