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