What Default Programs Are and Why You Might Change Them

A default program is the process Windows automatically opens when you click on a certain file type. For example, if you set Firefox as your default browser, Windows opens Firefox whenever you click a link or an .html file. By default, Windows comes with its own programs — Edge for browsing, Photos for images, Notepad for text files — but you can swap any of them for something else.

You might want to change defaults because you prefer a different browser, want to edit images in Photoshop instead of the built-in Photos app, or need to open PDFs in a reader other than Microsoft Edge. Windows lets you change defaults one file type at a time, or you can reassign all file types associated with a program in one step.

Key Takeaways

  • Open Settings, go to Apps > Default Apps, and search for the program you want to set as default to change all its file types at once.
  • To change one file type only, search for "Choose default apps by file type" in Settings and click the file extension you want to reassign.
  • Right-clicking a file and selecting "Open with" lets you pick a different program for just that one file without changing the default.
  • If a program does not appear in the default apps list, it may not be registered with Windows; reinstalling it usually fixes this.
  • Changes take effect when ready and do not require restarting Windows.

Change All File Types for One Program at Once

The fastest way to make a program your default for everything it can open is to set it as the default in the main Apps menu. Open Settings by pressing Windows key + I, then click Apps on the left sidebar and select Default Apps.

Scroll down or search for the program you want to set as default — for example, "Chrome" or "VLC". Click on it, and Windows shows you a list of all the file types that program can handle. Click Set as default, and Windows reassigns all of those file types to that program in one action. This is the simplest route if you are switching browsers, media players, or image editors entirely.

Change One File Type at a Time

If you want to keep most defaults as they are but change just one file type — say, open .mp3 files in Spotify instead of your current music player — use the file-type-specific menu. In Settings, go to Apps > Default Apps, scroll to the bottom, and click Choose defaults by file type.

A long list appears showing every file extension Windows recognizes. Find the one you want to change — for example, .pdf or .jpg — and click it. A menu pops up showing all programs on your computer that can open that file type. Click the program you want, and that file type is now assigned to it. You can change as many individual file types as you need without affecting the others.

Change the Default for One File Right Now

If you just want to open a single file with a different program without changing the default, right-click the file and select Open with. A submenu shows programs that can open that file type. Click the one you want, and the file opens in that program. This does not change your default — the next time you open a file of that type, it still uses your original default program.

If the program you want does not appear in the "Open with" menu, click Choose another app at the bottom of the submenu. A larger list appears. If your program still is not there, scroll down and click Look for another app on this PC, then navigate to the program's installation folder and select its .exe file.

What to Do If a Program Does Not Appear in the List

Sometimes a program you have installed does not show up in the default apps menu. This usually means the program was not properly registered with Windows during installation. The simplest fix is to uninstall and reinstall the program. Go to Settings > Apps > Installed Apps, find the program in the list, click the three dots next to it, and select Uninstall. Then read and run the installer again from the program's official website.

If reinstalling does not work, the program may not support being set as a default. Some older or specialized applications do not register themselves with Windows in the way the system expects. In that case, you can still open files with that program by right-clicking and choosing "Open with," but you cannot set it as the automatic default.

Resetting Defaults Back to Windows Apps

If you want to undo your changes and go back to Windows' built-in programs, the process is the same as setting a new default. Open Settings > Apps > Default Apps, search for the Windows app you want to restore — such as Microsoft Edge or Photos — and click Set as default. You can also reset individual file types by going to Choose defaults by file type and reassigning them one at a time.

Windows does not have a "reset all to factory defaults" button, so you have to change each program or file type individually. If you have changed many defaults and want to start fresh, the quickest approach is to go through the main program list and set each Windows app as default for its category.

Troubleshooting Common Problems

If you set a default but it does not seem to take effect, try closing and reopening the file. Sometimes Windows caches the old default in memory. If that does not work, restart your computer — though this is rarely necessary, a restart clears any lingering settings cache.

If a file type has no default set at all, Windows asks you which program to use every time you open that file type. This is not an error; it just means you have not assigned a default yet. Use the "Choose defaults by file type" menu to pick one, or right-click the file and select "Open with" to choose a program for that one instance.

If you are on a work computer managed by your employer, your IT department may have locked certain defaults so you cannot change them. Contact your IT support if you cannot change a default even after following these steps.

Frequently Asked Questions

Can I set different defaults for the same file type on different drives?

No. Windows applies defaults globally across your entire computer, regardless of where a file is stored. If you set .pdf files to open in Adobe Reader, all .pdf files on all drives will open in Adobe Reader unless you right-click and choose a different program for that specific file.

What happens to files I opened with the old default after I change it?

Nothing. Files you already opened stay open in whatever program you used. The new default only affects files you open going forward. If you had a Word document open in Notepad and then set Word as the default for .docx files, that document stays in Notepad until you close it.

Do I need to restart Windows after changing a default?

No. Changes take effect when ready. You can change a default and open a file with the new default right away without restarting.

Why does my browser keep resetting to Edge?

Windows sometimes resets your default browser back to Edge after major updates. This is not a bug — it is how Windows is designed. If this happens, go back to Settings > Default Apps, search for your preferred browser, and set it as default again.

Can I set a program as default if it is not installed yet?

No. A program must be installed on your computer before it appears in the default apps list. read and install the program first, then set it as default through Settings.