If a ZIP or RAR file still lands in File Explorer or the wrong app after you installed 7-Zip, the default app set for that file extension is the cause. Change it per extension in Settings > Apps > Default apps, or in bulk from the System tab in 7-Zip’s options. Only the extensions you assign are affected: every other archive type keeps its current app.
Office apps can complain about defaults too, for example when another app takes over document types and you need to silence the Word default program prompt.
Decide which file types should open in 7-Zip
You don’t have to hand over everything. Each extension has its own default, so make the call type by type. These steps apply to current versions of Windows 11.
| Extension | Hand it to 7-Zip? | What to weigh |
|---|---|---|
| .7z | Yes | 7-Zip’s own format, which it can both open and create. |
| .rar | Yes, if you open many | 7-Zip unpacks RAR but can’t create it. See also how to open RAR files on Windows. |
| .tar, .gz, .tgz | Yes | 7-Zip packs and unpacks TAR and GZIP. Here’s how to open a GZ file in Windows. |
| .zip | Optional | Windows handles ZIP itself, so this is a preference. Switch if you want one app for every archive. You can also password protect a ZIP file in Windows 11. |
| .iso | Think twice | 7-Zip can unpack ISO, but the change may stop double-click from opening a disc image the way Windows normally does. |
Microsoft’s page says Windows 11, version 24H2 supports ZIP, RAR, 7z and TAR archives but not operations on encrypted archive files, and it names 7-Zip as one option for those. It doesn’t restate this for later versions. Still, a password-protected archive that Windows refuses to open is a good reason to assign that type to 7-Zip.
If 7-Zip isn’t installed yet, get it from 7-Zip’s download page. The x64 installer suits most PCs, and the ARM64 one is for Windows on Arm. On older machines, see how to unzip files on Windows 7.
Set one extension at a time in Default apps
This is Windows’ own route. Microsoft’s guide to changing default apps covers the same Settings page.
- Open Settings > Apps > Default apps.
- In the search bar, type the extension, including the dot, such as .rar.
- Select the matching result.
- Choose 7-Zip from the list of apps (it’s usually shown as 7-Zip File Manager) and confirm if asked.
- Repeat for each extension you picked in the table.
The same page also lists apps under Set defaults for applications. Select an app there to see its file and link types and change them one by one. For a wider walkthrough of this page, see how to set default apps in Windows 11. Browsers work a bit differently, as covered in changing the default browser.
Set many types at once from 7-Zip’s System tab
Doing a dozen extensions one by one gets old. 7-Zip’s own options page handles them together.
- Open the Start menu and search for 7-Zip File Manager. To change the All Users list, right-click it and choose Run as administrator. For your own account only, a normal launch should be enough.
- Go to Tools > Options and open the System tab.
- Find the two lists, labeled Current User and All Users.
- Click a cell to change one extension, or click the + button to change all of them at once.
- Save your change and close the Options window.
7-Zip’s help says setting associations for All Users requires administrator rights. If the All Users list won’t change, you probably opened the app the normal way, so close it and relaunch as administrator.
Cells show one of four states: unassociated, linked to another program, linked to another 7-Zip edition (shown as [7-Zip]), or linked to the copy you have open (shown as 7-Zip). Be careful with + if you decided to keep .iso or .zip with Windows, because it changes every extension. Click those cells back afterward.
Test a file, then fix any type that fell back
Double-click a sample of each type you assigned. Default apps also usually shows the current app when you search an extension, though Microsoft’s page doesn’t describe this.
- One type still opens elsewhere: Assign it in Default apps, even if you already did so in 7-Zip. Windows’ setting decides what happens on double-click.
- 7-Zip isn’t offered as a choice: Update or reinstall 7-Zip first. If the picker offers a way to browse for an app, the program file is 7zFM.exe, normally in the 7-Zip folder inside Program Files if you kept the default install location.
- Your choice changed later: Another app or a Windows update may be involved, though vendor pages don’t document this, so treat it as a possibility. Set the type again and note what you installed just before it changed.
Default apps sets what opens when you double-click. Right-click commands are set separately. If 7-Zip isn’t in the shorter Windows 11 menu, select Show more options. Microsoft’s File Explorer menu page says older commands stay available there and that some extensions may not appear in the streamlined menu.
To change what 7-Zip adds to the menu, go to Tools > Options > 7-Zip. The options there include Integrate 7-Zip to shell context menu, Cascaded context menu and Context menu items.
Hand archives back to Windows
Changed your mind about a type? Open Settings > Apps > Default apps, search for the extension, and pick the Windows option (File Explorer, though the wording in the list may differ). Or open 7-Zip’s System tab and click that extension’s cell until it shows no association. If the type doesn’t return to Windows, use Default apps. If you set it under All Users, run the app as administrator again.
On a shared PC, the two lists matter. Current User changes your account only, while All Users applies more widely and needs administrator rights. On a work or school PC, you may not have those rights, and your organization may also manage some defaults. Use the Current User list, and if your choice won’t hold, ask your IT team.
7-Zip file association questions
Can I make 7-Zip open only .7z and leave .zip to Windows?
Yes. Assign .7z alone in Default apps, or click only that cell on the System tab and skip the + button.
Do I need admin rights to set my own associations?
Not for your own account, going by 7-Zip’s documentation: its release notes say associations can be set without administrator rights, and its help reserves that requirement for the All Users list. If the Current User list won’t change, relaunch as administrator, which is also what 7-Zip’s FAQ tells Windows 7 and Vista users to do.
Can I change how an archive opens without changing the default?
Yes. Open 7-Zip File Manager first and browse to the archive from inside it. The default stays as it was.
Can 7-Zip make a .rar archive after I switch?
No. 7-zip.org lists RAR as unpacking only. It creates formats such as .7z and .zip.
If an extracted file refuses to go away afterward, here’s how to force delete a file in Windows 11.
Next, double-click one archive of each type you changed, so you catch anything that fell back before you actually need it.
Kermit Matthews runs Live2Tech from just outside Philadelphia. He is an IT specialist with over 20 years of experience, from a university help desk to small-business IT, IT management and his own consulting practice, and has written tech guides full time since 2020. Steps are checked against the current software on a real device or the maker’s official documentation. More about Kermit.