If you don't know the application which function as MOI file opener then try to search for 'MOI wiki', 'application to open MOI file' or 'open MOI file' queries in the search engine you like.If you know the application which can open MOI file then run it and see if there is a File->Open main menu option in the application.If a MOI file is not opened in an application and you instead get a 'Windows can't open a file' error message you should try looking for an application which can open the file in question.Find a MOI file in question in Windows OS File Explorer and double click on it to launch the corresponding application.
