A dll file is an ActiveX control on one computer and cannot be registered as ActiveX on another

There is an assembly (.dll) on a Windows 7 system, 32-bit. In a VS2010 project on the Windows 7 system the assembly is referenced as an ActiveX control . The programmer has left the company and I am taking over the project. I am running Windows XP 32-bit. I copied the .dll file from the directory on his computer to the same relative directory on my computer. When I create a reference for the .dll on my computer, the reference is created as an assembly, not ActiveX. If I try to register the .dll with regsvr32, I get an error stating that the entry point was not found.
How could the same file be ActiveX on one system and not another? I have had other people check the dirextory paths to make sure I got the same file.

Any help would be appreciated.
TIA
WilliamsDigiSolSenior Systems SpecialistAsked:
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käµfm³d 👽Commented:
Is there a .tlb file available for that component?
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piattndCommented:
open command prompt.

cd C:\Windows\Microsft.NET\Framework\(version 2 or 4)

execute command:

regasm "{pathtodll\dllName.dll}" /tlb:"pathtoDLL\dllName.tlb" /codebase

See if that works.
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WilliamsDigiSolSenior Systems SpecialistAuthor Commented:
There ia a .tlb file for another project in the same solution which appears to be a wrapper for the component, but no .tlb files for that component.
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WilliamsDigiSolSenior Systems SpecialistAuthor Commented:
I got something wrong in the command and will have to play with it. I copied and pasted through Windows Explorer and get: The given path's format is not supported.
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piattndCommented:
It sounds like the path is wrong.  If the DLL is in a folder in program files called "programA" and the dll name is "activeControl.dll", the command would be:

regasm "C:\Program Files\programA\activeControl.dll" /tlb:"C:\ProgramFiles\programA\activeControl.tlb" /codebase
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WilliamsDigiSolSenior Systems SpecialistAuthor Commented:
I need a few other minor changes, but I never would have gotten there without you help.
Thanks.
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piattndCommented:
Hope you get it all sorted.  Good luck to you!
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