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To change which program opens a file or link, open Settings > Apps > Default apps. Search for the file extension (such as .txt) or link type, select the result, and choose an installed app from the list. You can also select an app first and edit the file and link types associated with it. The procedure works in Windows 10 and Windows 11, although wording and screen layout can vary after updates.
What a Windows default app controls
Windows stores an association between a type of item and the application that should open it. A filename extension identifies a file type: .txt commonly identifies a plain-text file, while a protocol identifies a kind of link. When you double-click a file or activate a link, Windows checks that association and launches the selected application.
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A default is not the same as an exclusive choice. Other installed programs may still be able to open the item through an Open with command, and some applications offer their own settings for registering file types. Changing a default changes the automatic choice for the specific associations you edit.
Microsoft’s official procedure is summarized this way: “If you want to change something, select the file or link type, then choose your preferred app.” You can follow the full instructions in Microsoft Support’s Change Default Apps in Windows guide.
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Before you change an association
Confirm the exact file extension or link type
Decide whether you are changing one narrow association or a group of associations. If only text files should open in a different editor, change .txt rather than every document type. If you want a browser to handle web links, identify the link types shown by Windows and change only the ones you intend to use.
File Explorer may hide extensions by default. Turn them on before you search so that you do not mistake a filename for its type:
- Open File Explorer.
- Select View, then open Show and enable File name extensions. (On some Windows builds, the command appears directly under View.)
- Inspect the complete filename, including the characters after the final period.
The extension is a label used to identify the type; renaming it does not convert the file. For example, changing report.txt to report.pdf does not create a PDF and can make the file harder to open.
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Windows only offers applications that declare support for the association. If the program you want is absent from the choices, install it using its legitimate distribution channel, finish any first-run setup, and return to Default apps. Some portable or very old programs do not register themselves, so they may not appear even though they can sometimes open a file through a manual browse command.
Choose the scope of the change
- One file type: change a single extension, such as
.txt, without altering other document formats. - Several types for one app: open the app’s Default apps page and review each association Windows lists.
- One-time choice: use Open with for an individual file when you do not want to alter the system-wide default.
- Link handling: edit the protocols or link types displayed for the browser or mail application rather than assuming every link category will change automatically.
Set a default by file extension or link type
This is the most precise method and is the best starting point when you know exactly what Windows should do.
Windows 11
- Open Settings. You can select it from the Start menu or press
Windows + I. - Select Apps, then Default apps.
- Use the search box to enter a file extension, such as
.txt, or a link type/protocol shown by Windows. - Select the matching result.
- Choose the preferred application from the offered list and confirm the change if Windows asks.
- Repeat only for the additional extensions or protocols that should use the same app.
Windows 11 presents associations individually. Selecting one app does not necessarily assign it to every format that app can handle, so review the list and change each required type.
Windows 10
- Open Settings with
Windows + I. - Select Apps, then Default apps.
- Scroll to the file-type or protocol controls, or use the available search field to locate the extension or link type.
- Select the current default beside the association.
- Pick the application you want from the choices Windows provides.
The names and placement of controls can differ between Windows releases. If the page looks different, type Default apps into the Settings search box and open that result instead of relying on a remembered menu path.
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Use this route when you want to audit what one program currently handles. It is useful after installing a new editor, browser, or mail client, because it exposes the associations Windows has registered for that application.
- Open Settings > Apps > Default apps.
- Search for the application name, or select it from the list of installed apps.
- Review every file extension and link type displayed on the app page.
- Select an association whose current app is not the one you want.
- Choose the replacement app and confirm.
- Continue through the list, leaving unrelated types unchanged.
This method gives you a broad review without making an “all formats” assumption. Two programs can support some of the same formats while differing on others, and Windows may list only the associations each program has declared.
Change the app for one file only
When you want to test another program or open a file one time, do not change the global association. In File Explorer:
- Right-click the file.
- Select Open with, then Choose another app.
- Select an installed application from the list.
- Use the checkbox offered by Windows if you want this choice to become the new default; leave it clear for a one-time opening.
- Select OK or Just once, depending on the wording in your Windows version.
If the application is not listed, use the browse option to locate its executable only when you trust the program and know it supports the file. Picking an arbitrary executable can produce errors or cause Windows to open the file as unreadable data.
Make a browser the default for links
Browsers can register several kinds of associations rather than a single “web” setting. In Default apps, search for the browser name or inspect the link types it supports. Assign the protocols and file or link types you actually want that browser to handle.
- Open Settings > Apps > Default apps.
- Search for the browser, or select it from the installed-app list.
- Review the listed link types and protocols.
- Select each association you want to change and choose the browser.
- Open a test web link from a document or message to verify that Windows uses the intended program.
Windows 11 also exposes a Set defaults for applications view. Select the browser there, then use its default action and review the individual associations Windows presents. Do not assume that changing one protocol changes every link category; confirm the entries that matter to your workflow.
If your preferred browser does not appear, check that it is installed for the current Windows account and that its setup completed successfully. A browser can be installed yet absent from the offered list if it has not registered the relevant handlers.
Set an email application as the default
Mail handling has a different layout in Windows 10 and Windows 11. Outlook is the example documented by Microsoft, but the same principle applies to another installed mail application when Windows lists it as an available choice.
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|---|---|---|---|
| Windows 10 | Settings > Apps > Default apps, then the Email entry | Select the preferred mail application for the email association | Mail handling as presented in the Default apps page |
| Windows 11 | Settings > Apps > Default apps > Set defaults for applications, then select Outlook | Assign each supported mail file type and link type individually | .eml and .hol, among the types Microsoft lists |
Windows 10 email steps
- Open Settings > Apps > Default apps.
- Select the Email entry.
- Choose the installed mail application you want Windows to use.
- Open an email link or a saved mail file to verify the result.
Windows 11 email steps
- Open Settings > Apps > Default apps.
- Select Set defaults for applications.
- Search for and select Outlook, or select your preferred mail application if it is listed.
- Review the supported file and link types.
- Select each type, including any relevant entries such as
.emlor.hol, and assign the mail application.
A mail application can be the default for saved message files while another program handles mail links. Check both categories if you need consistent behavior.
Windows 11 S mode: the browser restriction
Windows 11 in S mode keeps Edge as the default browser. Microsoft says that using a different default browser requires switching out of S mode. The switch is permanent, so treat it as a device-level decision rather than a temporary setting.
- Stay in S mode if the built-in browser arrangement meets your needs and you want to preserve that restricted configuration.
- Consider switching out only after confirming that the software you need cannot work with Edge and that you accept the permanent change.
- After leaving S mode, use Settings > Apps > Default apps to assign the other browser’s supported link types.
Because the change cannot be undone by simply selecting a setting, check the device owner’s policies and your required applications first.
How to choose between two available apps
Windows shows availability, not a quality ranking. Use the following decision order when more than one program is offered.
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| Question | How it affects the choice |
|---|---|
| Does it support the exact extension or link type? | Choose only from applications Windows offers for that association; a program that opens one format may not handle another. |
| Do you need one type or many? | Change a single extension for a narrow result; use the app page to review a group of associations. |
| Is the program installed and registered? | If it does not appear, complete installation or registration before changing settings. |
| Are device restrictions involved? | S mode can prevent a different browser default until you permanently leave that mode. |
| Does the choice fit your workflow? | Consider which program you already use for editing, reading, mail, or browsing, and avoid assigning unrelated formats merely because an app appears in the list. |
For a cautious rollout, change one association, open a representative file or link, and then decide whether additional types should follow. This avoids unintentionally redirecting formats that you prefer to keep with another application.
Verify that the change worked
Test a file association
Open a file with the exact extension you changed. If the new program launches and displays the content correctly, the association is working. Test a second file from the same type if the first file has an unusual name or location.
Test a link association
Activate a web link from a document, or use a mail link if you changed email handling. Confirm the intended application opens and that the link reaches the expected destination. A browser association test does not verify mail protocols, so test each category you edited.
Check the setting again
Return to Settings > Apps > Default apps, search for the extension or protocol, and confirm the displayed application. This is especially useful after a major application update, which may ask to reclaim its associations.
Troubleshooting when Windows uses the wrong app
The extension is missing from the search
- Turn on File name extensions in File Explorer and verify the characters after the final period.
- Search for the extension including its leading period, such as
.txt. - Check whether the item is actually a link or protocol rather than a file.
- If the type is not registered, use Open with > Choose another app for the individual file and then decide whether to make that choice permanent.
The preferred app is not offered
- Confirm that the application is installed for the current device or account.
- Open the application once and complete any setup it requests.
- Install a current version from a trusted source if the existing copy is incomplete.
- Use the app’s own file-association option only when Windows does not expose the type and you understand which formats it will claim.
The app opens, but the file is unreadable
Recheck the extension and select a program that supports that exact type. Renaming an extension does not convert the content, so restore the original extension if it was changed. If the file itself is damaged, changing the default app will not repair it.
Only some links open in the new browser
Return to the browser’s Default apps page and inspect every relevant protocol and link type. Assign the missing entries individually. Windows may preserve a separate association for a different protocol, and a browser can support one link category without being registered for another.
A mail link still opens another program
On Windows 11, check the individual mail link types under Set defaults for applications, not just saved-message extensions. On Windows 10, revisit the Email entry and then test the exact kind of link that failed.
The setting keeps reverting
Check whether the application has a startup or update prompt that asks to become the default. Reapply only the associations you want, and review the Default apps page after the next update. On a managed device, an administrator policy may also control available applications or settings.
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A compact checklist
- Identify the exact extension, protocol, or email association you want to change.
- Open Settings > Apps > Default apps.
- Search by extension/link type for a narrow change, or select an app to audit several associations.
- Choose only an application Windows lists for that association.
- For one-time use, choose Open with > Choose another app instead of changing the global default.
- On Windows 11, assign Outlook’s supported mail types individually if you want it to handle both files and links.
- Remember that Windows 11 S mode keeps Edge as the default browser unless you permanently leave S mode.
- Open a representative file or link and verify the result.
Bottom line
Use the Default apps page to make precise, reversible association choices: search for the extension or link type when you know the exact target, or open an app’s page when you need to review several formats. Keep one-time experiments in Open with, check both file and link categories for mail and browsers, and account for S mode before changing browser defaults.
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