: A typical RAR file consists of a series of blocks: a Marker Block ( MARK_HEAD ), an Archive Header ( MAIN_HEAD ), and individual File Headers for each compressed item.

: You can inspect the raw data or metadata of such archives using the WinRAR GUI "Info" page or forensic tools like ugrep --filter to search inside the compressed entity. Need to open, create, or convert a RAR file? - WinZip

If your inquiry refers to a different mem.rar , the following technical characteristics apply to any file of this type:

The mem.rar contents (or the resulting dump) are opened in a hex editor like WinHex.

Values are changed (e.g., to adjust the width of Japanese font characters) and then written back into the emulator's active RAM.

The file is associated with a niche memory-patching technique used for modding or translation projects in the Spyro the Dragon emulation community. It specifically contains a memory dump used to modify game data—such as character text widths—within the ePSXe PlayStation emulator. Technical Context & Use Case