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It seems this is already answered in #124916 support case.
However, to confirm if the above application is built on .Net framework or not, please run the following command
"mscor*"and see if the Microsoft NAV application is listed in the above command output. If the application is not showing then deffinetely it is not built on .Net framework and can not be instrumented with the .Net Agent. If the applicatio is not build on .Net framework then as the next step we suggest you to contact the Microsoft get the exact details of the framework and based on the feedback you can use other Agents like (C/C++, Node.js/Php etc.,)