Windows will open each type of file by using a particular program. It does this through file type associations. However, if a file type isn’t opening in the program you want it to by default, have no fear: it’s very easy to change.
Whether you’ve got a broken file type association or just want to use another program, this three methods below will sort it out and let you have full control over the association defaults.

What Are File Type Associations?

Every file on your system is stored in a particular format. And certain programs can only open certain files. For example, a photo file like .jpg can’t be opened in a word processor like Notepad. Instead, you’d open the file in something like Windows Photo Viewer.

How Can File Types be Seen?

Revealing file types is easy. First, navigate to the folder which contains your file in File Explorer. Then, right click the file and select Properties. A new window with details about that particular file will open. Type of file will tell you what the file extension of the file is. Opens with will tell you what program it’ll open in.

You can set it so that the file extension appears with the file name in File Explorer. To do this in Windows 8 and above, open File Explorer and click the View tab. Then tick the box for File name extensions.
To achieve the same effect on Windows 7, click Organize, then Folder and search options, then the View tab. Locate the line Hide extensions for known file types and untick the box. Then click OK.

How to Change File Type Associations

There are three quick and easy methods within Windows to change the file type associations.

1. Open With

You can change the file type associations direct from the File Explorer. To do so on Windows 10 and 8, right click the file and then hover on Open with. You’ll see a list of programs, which you can use to open the file, but note that this will just be a one off and won’t change your settings permanently. To make a permanent change, select Choose another app.
Now select the application from the list that you want to use to open the file type of the file you’ve chosen. If you don’t see the program you need, scroll down and select More apps for a wider selection. If it’s still not there, select Look for another app on this PC. You can then go through your Program Files and locate the executable for the program you want.

When selected, tick Always use this app to open .X files at the bottom of the window. The ‘X’ will be replaced with the extension of the file you’re using (so in the case of the screenshot above, that’s the image format .jpg.) This will permanently change the file type association. Then click OK.
The process is essentially the same for Windows 7 and prior, except that Open with isn’t expandable and you can Browse for an alternative program straight from the window that opens.

2. Set Your Default Programs

This method is suitable for when you want to select what file types a particular program should open. To find it, do a system search for set default programs and select the result. Along the left-hand side you’ll find a list of all the programs installed on your system. Select the program that you wish to adjust the defaults for and its information will appear on the right.

If you want to use the program to open all the file types it can, select Set this program as default. If you want more control over which file types it opens, select Choose defaults for this program. You’ll see a list with all the available file types, along with what their current default program is. To change them, select or deselect the tick boxes as appropriate and then click Save.

3. Associate a File Type with a Specific Program

This method is best for when there’s a particular file type that you want to change the program association for. First, do a system search for change the file type and select the relevant option. You’ll see a list of all the file types on your system, along with what the current default program is to open it.
To adjust a file type’s default, select if from the list and click Change program…. Select a program from the list to change the default to. If you don’t see the program on Windows 7, click Browse to find it. On Windows 8 and above, scroll and request More apps and then Look for another app on this PC if you still can’t find it. When selected, press OK.