How to Change File Association to Unknown Program in Windows 10?<br /><br />Step 1: Open "Notepad" App by typing Notepad in Search Box and type cd.<br /><br />Step 2: Click on "File".<br /><br />Step 3: Click on "Save as".<br /><br />Step 4: Select Desktop as the destination.<br /><br />Step 5: Select "All Files" option in "Save as Type."<br /><br />Step 6: Give name to the file as "abc.bat" without quotes.<br /><br />Step 7: Click on "Save" button.<br /><br />Step 8: Now, Right click on any file that you want to change association to unknown.<br /><br />Step 9: Choose "Open with".<br /><br />Step 10: Click on "Choose another App".<br /><br />Step 11: Click on "More Apps" and then check the box Marked "Always use this App".<br /><br />Step 12: Scroll down and click on "Look for another app on this PC."<br /><br />Step 13: Navigate to Desktop and select "abc.bat" file, and then click on 'open' button, you might get message "This app can't run on your PC", just click on Close.<br /><br />Step 14: Finally, delete the abc.bat file from your desktop.<br /><br />Step 15: Restart the computer.<br /><br />That's it.<br /><br />Thanks for watching, please like and subscribe <br /><br />============================================== <br /><br />https://www.facebook.com/HowtoTutorialsByAmit/