Letterboxing is the process of adding black bars to the top and bottom of a movie or video after shrinking the whole image to fit a smaller screen, which otherwise could not accommodate the wide resolution of the film. This is done because most movies or films are shot in a widescreen format meant for the theaters, which is wider than the format...
A cabinet file (CAB) is a compression file format used by Microsoft installation engines. Many installers use CAB for file compression using a broad range of file headers. Its file extension is .cab.
The CAB file format enables single file compression of multiple files, which facilitates installer package creation. CAB and ZIP archives are similar because each format compresses multiple files into a single file container. A cabinet icon represents ZIP files.
CAB holds multiple files and includes reserved file header space for digital signatures or other data. CAB often attaches to self-extracting programs or installers. Microsoft CAB File (MSCF) markers provide simple identification. MSCF and InstallShield are incompatible file types.
CAB enables the following three different compression formats:
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