Instructions apply to Windows 11, 10, 8, 7, Vista, and XP.

TheChoose defaults by file typeoption is found in the Windows 11 configs.

Right-nudge the Start button (or use theWIN+Xkeyboard shortcut) and selectSettings.

Apps settings for Windows 11

The hotkeyWIN+iworks, too.

SelectAppsfrom the left panel, and thenDefault appsfrom the right.

Scroll to the very bottom, and selectChoose defaults by file jot down.

Choose defaults by file type link in Windows 11 settings

Click or tap one of the file types in the list.

Pick an installed program from the pop-up list, or chooseBrowse apps in the Microsoft Store.

Right-grab the Start button (or use theWIN+Xhotkey) and chooseSettings.

How do you want to open mp4 files from now on prompt

ChooseDefault appson the left.

Scroll down a little and selectChoose default apps by file bang out.

Locate the file extension for which you want to change the default program.

Settings item in Windows Pro menu

grab the program to the right of the file extension.

If there isn’t one listed, selectChoose a defaultinstead.

In the pop-up window, pick a new program to associate with that file extension.

Apps button in Windows 10 Settings

In Windows 8, thePower User Menu(WIN+X) is the quickest way.

Use the Start menu in Windows 7 or Windows Vista.

You’ll only see this link if you’re on theCategoryorControl Panel Homeview of Control Panel.

Default apps sidebar item in Windows 10 Settings

Otherwise, chooseDefault Programsinstead, followed byAssociate a file key in or protocol with a programlink.

Skip to Step 4.

SelectAssociate a file pop in or protocol with a programon the following page.

Choose default apps by file type link in Windows 10 Settings

grab the file extension to highlight it.

Choose theChange programbutton, located just above the scroll bar.

TryMore optionsfor the complete list.

Control Panel in Windows 7

Windows 7 & Vista: Choose the app that should open for this extension.

TheRecommended Programsare probably the most applicable, but there may beOther Programslisted, too.

UseBrowseto manually locate a program.

Programs in Control Panel

You’ll only see that link if you’re using theCategory Viewof Control Panel.

If you’re instead using theClassic View, chooseFolder Optionsinstead and then skip to Step 4.

SelectFolder Optionsnear the bottom of the window.

Default Programs

Choose the extension to highlight it.

SelectChangein the lower section.

If you don’t see that screen, chooseSelect the program from a list, and thenOK.

Associate a file type or protocol with a program

SelectOKand thenCloseback on the Folder Options window.

Doing this doesn’t actually change the file association for that file as explained above.

Also, changing the file association doesn’t change the filetype.

Change program button in Set Associations applet

Changing the file’s bang out/format is usually done with afile conversion tool.

Whether you want to troubleshoot an issue oredit the HOSTS file, use File Explorer to locate the file.

HOSTS can be found at C:\Windows\System32\drivers\etc.

More options link in Set Associations

Browse button in Open with dialog box

Appearance and Themes in Windows XP Control Panel

Folder options link in Windows XP Appearance and Themes

Change button in Folder Options for Windows XP

Windows XP file association settings