How to register a .NET assembly as COM?

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Are you sure you have the right RegAsm in your path since you’re calling it by exe name only without specifying the full path? You must call the right version of RegAsm for it to work, i.e 32 or 64-bit version of .NET 4.

Try specifying the full path:

c:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe /codebase F:\Workflow\WorkflowHandler\bin\debug\WorkflowHandler.dll

or 

c:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe /codebase F:\Workflow\WorkflowHandler\bin\debug\WorkflowHandler.dll

Also I noticed that in the path to your assembly you had some / characters instead of \. Make sure you’re putting in the correct path.

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