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 Five ways to open Device Manager in Windows 10br br 1st:br br Go to Windows search bar and type "Device Manager" without quotes, it will show you. Click on it to open it. br br 2nd:br br Go to Windows start button and right click on it, Click on "Device manager" to open it.br br 3rd:br br Step 1: Go to Windows start button and right click on it, Click on "Settings" to open it.br br Step 2: Click on "System".br br Step 3: Type "Device manager" without quotes in search box, and then click on "Device Manager" to open it.br br br 4th:br br Press Windows + R key on the keyboard to bring the run window, and then type "devmgmt.msc" without quotes and click on 'ok' button. It will open the Device manager window.br br br 5th:br br Step 1: Go to Windows Search bar and type "Control Panel" without quotes, click on control panel to open it.br br Step 2: Click on 'System'.br br Step 3: In the left Menu, click on 'Device Manager' to open it.