Flat rate is common in broadband access to the Internet in the USA and many other countries. A charge tariff is a class of linear rate, different from the flat rate, where the user is charged by the uploads and downloads (data transfers).
MUI stands for Multilingual User Interface and .dll.mui files are simply libraries(Dlls) that contain resources dedicated to localization : for an application to support multiple languages,dlls containing specific resources must be available eg language resources(arabic,french,english,chinese....
File extension errors generally occur when the appropriate program is not installed in your system or your registry may be corrupt. You can either. Scan your system to identify, fix and open .dll.mui file extension or. Protect your photos and documents from sudden system crashes. Backup Now.