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What is the .CAB File Extension?

.CAB File Extension Description:

Files with the .cab file extension refer to cabinet files, which are the native compressed format for archive by Microsoft Windows. Microsoft uses cabinet files in various installation engines, such as Setup API, AdvPack, Device installer, and Windows Installer.

Files in the .cab format are single files designed to hold several compressed ones. When a program is installed in Microsoft, files compressed in a .cab file are decompressed and then copied onto a designated directory. Microsoft uses CAB files to distribute its native products, like the Office Suite (PowerPoint, Word, MS Money, etc).

Files with the .cab extension are basically used for the organization of installation files in the operating system. Since the nature of CAB files are in compressed form, this saves space and time during software installations. This is most especially utilized in download time for content found in the Internet or on servers designed as corporate intranet.

Cabinet files, which have the .cab file extension, have two components: folders and files. Folders in a .cab format are a continuous block of data that are compressed. Files in a cabinet file are individual items that can span folders. Files found in a CAB file archive can become a single block by being compressed across file boundaries.

CAB files support three methods of lossless compression: MSZip, LZX, and storing. MSZip uses the DEFLATE algorithm, which is a combination of the Huffman coding and LZ77 algorithm, to compress files. LZX is also based on the LZ77 algorithm, uses more memory, but produces better ratios in compression compared to MSZip. Storing, last of the methods, simply means that the file is stored within a cabinet file, and is uncompressed.

Author: Microsoft Corporation
Author URL:
Related Applications: Microsoft Applications
Common Path: n/a


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Do you have errors with .CAB files?

The General Reason for .CAB files Errors to Occur:

A typical and frequent cause for .CAB files errors is damage in the Windows program registry - repairs are needed to avoid additional harm in other software and/or hardware devices. As long as the errors remain your system remains at risk for possible blue screen errors, hardware failure and fatal crashes.

Symptoms of .CAB files Errors:

Common symptoms from .CAB files errors include poor pc performance, long application load times, trouble opening documents, long pauses in program functions, software closes without showing an error message, input freezing and programs crash.

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How to Fix .CAB File Extension Errors    |    Scan for .CAB File Extension Errors    |    Repair .CAB File Errors