That's because they can contain malware, so it's recommended to run APK files through an online virus scanner before installing them (an Android antivirus app is also wise).

Description: How to Install Google Chrome on the Amazon Kindle Fire HD, full article: 1. Go into Settings → Device and scroll ...

There are ways to unofficially install Android apps using APK files as described in the article above. Can Windows 11 run Android apps from Google Play?