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And yes, definately C++/MFC and not .Net. The main class in the C++ code is CMFCRibbonBar.
Can you verify your application is fully supported based on the information given here Supported Development Tools | TestComplete Documentation
Also see Desktop Application Testing | TestComplete Documentation - you might need to do some pre-requirement setups first, and Object Identification | TestComplete Documentation. See https://support.smartbear.com/testcomplete/docs/app-testing/desktop/missing-debug-info-message.html
I suggest you create a new project, and try and get TestComplete to identify individual UI controls in your application first. Switch between enabling and disabling MSAA/UI Automation *, and switch to Advance View, and not Basic View.
Enable or disable this only, and to not add items to this listThis is to ensure and verify TestComplete can support your application.