Instead of risking a potentially malicious download, consider these safer methods for Windows 7:
If you only want to see what is inside an APK file (to see images or files), you don't need a special "opener." An APK is just a renamed ZIP file. You can right-click it and open it with 7-Zip or WinRAR . download-apk-file-opener-windows-7-onhax
The term "APK Opener" is often used loosely. To actually run an APK, you typically need an Android Emulator (like BlueStacks or LDPlayer). If the file is just a "file opener," it likely only allows you to view the internal code or assets of the APK, not play games or use apps. not play games or use apps.