Interop COM not working with MultiTerm 2021 and 2022 - HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)

When trying to use the Interop COM interface and create an Application instance, I always get the following error message (as if there is no MultiTerm installed on the system):

The COM class factory for the component with CLSID {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} could not be retrieved due to the following error: 80040154 Class not registered (exception of HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)).
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at RWS_MultiTerm_Interop_Test.frmMain.InitMultiTerm() in <PATH TO SOURCE FILE>:line 228.

A MultiTerm repair installation, as well as a complete reinstallation, has already been attempted. Likewise, testing has been done on multiple systems and with multiple MultiTerm versions, which are:

  • MultiTerm 2021 SR2 -
  • MultiTerm 2022 SR1 -

  • Microsoft Windows 7 Enterprise version 6.1.7601 Service Pack 1 Build 7601
  • Microsoft Windows 10 Pro Version 10.0.19045 Build 19045
  • Microsoft Windows 11 Pro Version 10.0.22621 Build 22621
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