To see what is specifically inside your "MB.rar" file, you must use an extraction tool: Supplementary data for - IOP Science
: Large PDF documents, such as a 4,000+ page service manual for a vehicle, which may be compressed from 75 MB down to a 35 MB RAR file. MB.rar
Because "MB" is a general unit of digital storage, several distinct types of content are commonly associated with archives named this way: Common Content Types To see what is specifically inside your "MB