How to Open CAB Files Online (Free, No Upload) [2026]
CAB (Windows Cabinet) files hold drivers, update packages, and legacy installer payloads. This guide shows how to open them instantly in your browser, plus the Windows expand command, 7-Zip, and how to reach a single driver .inf without running an installer.
Table of Contents
Quick Answer
The fastest way to open a .cab file without installing anything is the SammaPix CAB File Opener: drop your Cabinet file in the browser tab and you get the full file list immediately, ready to download individually or as a ZIP. Nothing is uploaded. On Windows you can also double-click the .cab to browse it, or run expand file.cab -F:* C:\destination from the command line.
What a CAB file actually is
A .cab file (short for Cabinet) is Microsoft's native archive format, introduced in the early 1990s and still used across Windows today. Like a ZIP, a single CAB is a container that bundles many files with a folder structure and compresses them, usually with the LZX or MSZIP algorithms.
What makes CAB different from a casual ZIP is where it lives. Windows itself relies on Cabinet files: device drivers ship as CABs full of .inf, .sys and .cat files; Windows Update delivers patches as .cab and .msu (which contain CABs); DirectX and Visual C++ redistributables unpack from CABs; and countless legacy InstallShield and Setup programs store their payload in one or more .cab files next to a small setup.exe.
Because CAB is so tied to Windows internals, you often want to reach one file inside without running the installer at all, for example to grab a single driver .inf and point Device Manager at it. That is exactly the case where opening the Cabinet directly beats double-clicking a setup wizard.
Where you run into CAB files
| Source | What is inside | Why open it directly |
|---|---|---|
| Driver package | .inf, .sys, .cat | Install manually from Device Manager |
| Windows Update (.msu) | .cab with patch payload | Inspect or offline-install a patch |
| Legacy installer | App files, DLLs, assets | Recover a file without installing |
| Font or redistributable | .ttf, runtime DLLs | Grab exactly what you need |
Ways to open a CAB, compared
| Method | Install needed | Works on | Upload risk |
|---|---|---|---|
| SammaPix online | None (browser) | Windows, Mac, Linux | None |
| expand / File Explorer | Built-in (Windows) | Windows only | None |
| 7-Zip | Desktop app | Windows | None |
| cabextract | CLI install | Mac, Linux | None |
Method 1: Online, no upload (SammaPix CAB File Opener)
The SammaPix CAB File Opener reads your .cab file in the browser using libarchive compiled to WebAssembly. It decodes the Cabinet, lists every file with its name and size, and lets you download items individually or the whole thing as a ZIP. Nothing is sent to a server, which matters for driver packages and enterprise deployment CABs.
- Open sammapix.com/tools/open-cab in any modern browser.
- Drop your file. Drag a .cab onto the drop zone, or click to select it.
- Browse and download. The full file list appears. Click any file to download it, or grab everything as a ZIP.
Open a CAB with zero install
Drop the file, see everything inside, download what you need. 100% in your browser, nothing uploaded.
Open CAB File, FreeMethod 2: Windows built-in (expand and File Explorer)
Windows opens CAB files natively, no download needed. For a quick browse, double-click the .cab in File Explorer and it opens like a folder; drag files out to a real folder to extract them. For scripted or bulk extraction, use the built-in expand command:
:: List the contents of a CAB without extracting expand -D file.cab :: Extract every file to a destination folder expand file.cab -F:* C:\destination :: Extract just one file (e.g. a driver .inf) expand file.cab -F:driver.inf C:\destination :: Extract a CAB inside a Windows Update .msu expand Windows6.1-KB.msu -F:* C:\extracted
The -F:* wildcard extracts all files; replace it with a specific name to pull just one. This is the cleanest way to reach a single driver file without running an installer.
Method 3: Mac and Linux (cabextract)
macOS and Linux have no native CAB support, but the open-source cabextract utility handles it well.
# Linux (Debian/Ubuntu) sudo apt install cabextract cabextract file.cab # macOS (Homebrew) brew install cabextract cabextract file.cab # List contents without extracting cabextract -l file.cab # Extract to a specific folder cabextract -d ~/Desktop/extracted file.cab
If you do not want to install anything, the browser CAB opener gives you the same result on any operating system.
Extracting a driver from a CAB
This is the single most common reason people open a CAB. A manufacturer gives you a driver as a .cab, but Device Manager wants an .inf file, not a Cabinet. The fix:
- Open the CAB in the browser tool (or expand it with
expand file.cab -F:* C:\drivers). - Extract all files to a folder, keeping the .inf, .sys and .cat together (they reference each other).
- Install from Device Manager: right-click the device, Update driver, Browse my computer, and point it at the folder with the .inf.
Also working with other archives?
SammaPix has dedicated openers for each format. All run in your browser with no upload.
Common errors and fixes
The CAB opens but is missing files
Some installers split their payload across multiple Cabinets (file1.cab, file2.cab, and so on) referenced by a .ddf or a header CAB. If a file spans volumes, you need all the parts in the same folder before extracting. Grab every .cab that came with the download.
"expand is not recognized"
The expand command is Windows-only. On Mac or Linux use cabextract, or the browser tool which needs nothing installed.
The file is a .msu, not a .cab
A Windows Update .msu is itself a Cabinet that contains an inner .cab with the actual patch. Extract the .msu first (rename to .cab or use expand), then open the inner CAB to reach the payload.
FAQ
What is a CAB file?
A .cab file is a Windows Cabinet archive, Microsoft's native format for bundling and compressing multiple files into one container. Unlike a plain .gz, a single CAB can hold many files with a folder structure. Windows uses CAB files for device drivers, Windows Update packages, DirectX redistributables, font packages, and legacy InstallShield and Setup installers.
How do I extract a single driver from a CAB file?
Driver packages downloaded from a manufacturer often arrive as a .cab containing .inf, .sys, and .cat files. Open the CAB in the SammaPix CAB File Opener, browse the file list, and download just the .inf (or the whole set). You can then install the driver from Device Manager by pointing it at the extracted .inf, without running any installer.
How do I open a .cab file on Windows without extra software?
Windows can open CAB files two ways. Double-click the .cab in File Explorer to browse it like a folder, then drag files out. Or use the built-in command line: expand file.cab -F:* C:\destination extracts everything. Both are native to Windows, no download needed. The browser tool is handy when you only want to preview or grab one file.
How do I open a .cab file on Mac or Linux?
macOS and Linux have no native CAB support. On Linux you can install cabextract (sudo apt install cabextract, then cabextract file.cab). On Mac you can use Homebrew (brew install cabextract). The simplest cross-platform option is the SammaPix CAB File Opener, which runs in the browser on any OS with nothing to install.
Are my files uploaded when I open a CAB online?
That depends on the tool. Many online extractors upload your file to their servers. The SammaPix CAB File Opener processes everything in your browser using libarchive compiled to WebAssembly, so your Cabinet file never leaves your device. That matters for driver packages and enterprise deployment CABs.
Is there a file size limit?
The free plan supports .cab files up to 200 MB, which covers virtually all driver and update packages. For larger Cabinets, a one-time 24-hour Day Pass ($2.99) removes the limit instantly.
Related archive tools on SammaPix:
