Hold down Command and click the file you want to unlock. This displays a context menu next to the file you want to unlock.5. Press Command and X to confirm before it is permanently locked. How to Unlock a File and Remove Access Restrictions While the File is Locked — Windows Step 1. Right-click on the file you want to unlock in any of your other applications, then use the contextual menu to click on the Open With window. Step 2. Search for the word “Windows” in the file text box, then click Open. Step 3. Click OK to open the file and continue to the next step. Step 4. Right-click on the open file and choose Open in Other Applications. It will now be opened in Finder which you can then continue to use. Open and Unlock Files While the File is Locked — Windows 10 Note: OS X Sierra 10.12.6 does not include the Open with Window menu option. 1. Open the Finder. It has an icon that resembles a blue and white smiley face. 2. Navigate to the .DMG file on your desktop, or use the File Explorer. 3. Right-click onto the .DMG file that says [NAME OF THE FILE]. 4. Click Open in Finder. 5. When the file opens, double-click onto the .DMG file that has a green icon on the left. Open and Unlock Files While the File Is Locked — Windows 10 Step 1. Open the Finder. It has an icon that resembles a blue and white smiley face. 2. Navigate to the .DMG file on your desktop. 3. Right-click onto the .DMG file that says [NAME OF THE FILE]. 4. Click Open. 5. When the file opens, double-click onto the .DMG file that has a green icon on the left.