Must visit: Top 10 Best Skype Alternatives For Video Calling So, I would suggest you all to learn from my mistake and use an app lock to protect imporant or confidential files and folders in your system. Fortunately, I got my important files back from the recycle bin but I might not be so lucky all the times. However, we do not think of using an app lock for PC until it’s too late. We all install app locks in mobile phone to protect our chats, images, videos, files or call history from unauthorized access. Guys, that time I realized the importance of app lock for PC but I realized it the hard way. Maybe he was searching for some games but accidently he deleted my important files. Recently, I lost some of my important files related to my upcoming project because my little cousin intruded into my system and pressed some random buttons.