Requirements

Microsoft .NET Framework 4.0 requirement

HCL Link Programming COM Interface requires .NET Framework 4.0 to register an assembly such as dtxInterop.dll.
  1. Download and install .NET Framework 4.0.
  2. To ensure that the current dtxCOM.dll is registered:
    1. Unregister the current dtxCOM.dll: 
      regsvr32 /u dtxCOM.dll
    2. Register the V1.0.0 dtxCOM.dll: 
      regsvr32 dtxCOM.dll

Use Microsoft .NET Framework 4.0 to register assemblies such as dtxInterop.dll. The regasm utility might require you to run the command prompt with administrator privilege.

Invoke the regasm utility from the Microsoft.NET\Framework directory. For example: 
C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm dtxInterop.dll