
Install the application you found and check if it can open MANIFEST file.If you don't know the application which function as MANIFEST file opener then try to search for "MANIFEST wiki", "application to open MANIFEST file" or "open MANIFEST file" queries in the search engine you like.

If you know the application which can open MANIFEST file then run it and see if there is a File->Open main menu option in the application.If a MANIFEST 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.

