For apps targeting Android 7.0, you can't use file URI when launch file related apps. Install this plugin when you have apps that only support File URI. In most cases, you do not need this plugin.
This app is primarily used for compatibility mode of the file manager. We advice to install this app only when users have specific problems to open files. This plugin is for using File URI. https://developer.android.com/about/versions/nougat/android-7.0-changes#sharing-files
If you do not have problems to open files and you do not understand that what is this plugin for, do not install this plugin.