File Type Association is a relationship in between a set of same type of files and and an application, such that this particular type of file will be opened with that particular application. Like all the image files ( with an extension like .jpg, .jpeg, .png etc) are opened with Photos application by default on Windows 10.
Now, File Type Association error happens when File Association gets corrupted on Windows 10, which leads to opening a file type with wrong application. Like you want to open a file with .pdf file but it is opening with a HTML browser (like Google Chrome or Microsoft Edge), not in a pdf processor( like Adobe Acrobat reader). This type of error can occur due to faulty registry keys or corrupted file association. Lets keep reasons aside and go for the fixes-
Fix-1 Reset all files to Microsoft defaults
Resetting all file types to Microsoft defaults can solve this problem as all the file types will be automatically associated to their default application type. Follow these steps to Reset all files to Windows default-
1.Press Windows key and type “Settings” and hit Enter.
2. Then click on “Apps” of the Windows Settings window.
3. Now, on the left pane click on “Default apps“. Then, on the right pane select “Reset” under “Reset to the Microsoft recommended defaults” option.
4. Reboot your computer.
Check if the File Type Association error is still there. If the error is still happening.
Fix-2 Delete particular Registry key for a particular file type
Deleting a particular registry key for a particular file type can solve the problem with File Type Association error. Follow these steps to delete the registry keys-
1. Press Windows key+R, and type “regedit” and hit Enter.
2. You are going to follow this path-
HKEY_CURRENT_USER > Software > Microsoft > Windows > CurrentVersion > Explorer > FileExts
On the left pane, click on “HKEY_CURRENT_USER“. Then click on “Software“. Next click on “Microsoft” to expand it.
Click on the “Windows” under “Microsoft” to expand it. Now, click on “CurrentVersion” to expand and click on “Explorer” to expand again. Then, click on “FileExts” to expand.
4. Now, right click on the particular file type (extension) you are facing problem with, and click on “Delete“. (For example .aac format is taken ).
5. Once you have done that, you have to reboot your computer.
Check if you can change file association type or not. If the error is still there then go for the next fix.
Fix-3 Reset File Association Type from Command Prompt
You can recover the File Association Type by running some command in the Command Prompt window. Now, to do so follow these steps-
1. Type “cmd” in the search box. Right Click on “Command Prompt” and click on “Run as Administrator“. Command prompt will be opened as an Administrator.
2. Copy and paste this command on Command Prompt interface and hit Enter.
dism /online /Export-DefaultAppAssociations:"%UserProfile%\Desktop\DefaultAppAssociations.xml"
Wait for a while until the process is complete.
This will export your File Association settings as a “DefaultAppAssociations.xml” named file.
In the next steps we will be importing the file i.e. restore the default settings-
3. Copy and paste this command in the command prompt and hit Enter.
dism /online /Import-DefaultAppAssociations:"%UserProfile%\Desktop\FileAssociations.xml"
4. Reboot your computer.
Check if the error is still there or not. If the error is still there then go ahead for the next fix.
In case you want to revert the changes you have made, just put this in command prompt and hit Enter.
Dism.exe /Online /Remove-DefaultAppAssociations
Fix-4 Set File Association type manually
You can always set file association type manually and solve your problem with ‘File Association type error’. In order to set File association type manually follow these easy steps-
1. First go to the file location where you are facing the problem (like, here for example a .txt file is taken). Now, right click on the file and click on “Open with“.
2. Now, click on “Choose another app“.
3. Now, select the default application which you want to associate your files with. Check the box that says “Always use this app to open .txt files“. Then click on “OK“.
This will ensure the File Association type to your selected default application.