Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.CAB
File Type
Cabinet File
Category
Archive
Best first step
Use compatible software
Quick Summary
A practical overview of the .cab file format
A CAB (Cabinet) file is an archive file format used in Microsoft Windows. It is a single file that can contain multiple compressed files, often used for software installation, system files, and device drivers. CAB files support various compression algorithms, including LZX, MSZIP, and Quantum. They…
File extension
.CAB
File type
Cabinet File
Category
Archive
Recommended action
Open with a trusted compatible app
How to open a .cab file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .cab.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .cab file?
File extension details and usage information
A CAB (Cabinet) file is an archive file format used in Microsoft Windows. It is a single file that can contain multiple compressed files, often used for software installation, system files, and device drivers. CAB files support various compression algorithms, including LZX, MSZIP, and Quantum. They are designed to efficiently package and distribute software components, reducing file sizes and simplifying the installation process. CAB files can also contain digital certificates to verify the authenticity and integrity of the contents. The format is often used by Windows Update, device driver installers, and other system-level utilities. While primarily associated with Windows, tools exist to extract CAB files on other operating systems. The internal structure of a CAB file includes a header, file entries, and data blocks, allowing for efficient extraction of individual files without decompressing the entire archive. The format is designed for reliability and is often used for critical system components.
Software Compatibility
Programs that may open or work with .cab files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .cab files be converted?
Options for saving or exporting this file to another format
In many cases, a .cab file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .cab file.
Why can't I open a .cab file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .cab format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .cab files
To open a .cab file, use software that supports this file format.
- Windows Explorer
- 7-Zip
- WinRAR
- PeaZip
- CabView
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .cab file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.