How do I get a APK file that is the android app of Square POS to open and work properly on a Windows 7 PC?
Any suggestions would be great.
Super User is a question and answer site for computer enthusiasts and power users. It only takes a minute to sign up.Sign up to join this community
Bluestacks is an emulator for Android that allows you to run Android apps (APK files) on Windows.
That should be all you need if you only require the app itself, and no connectivity to Square's peripheral devices.
In regards to whether it is safe,
A moderator of Reddit's /r/bluestacks subreddit has asserted that the software comes with signed certificates and does not include any other bundled software. You can trust the software as much as you trust the company Bluestack Systems Inc. itself.
That comment does also highlight that there are risks that may come from running some Android apps due to those apps containing malicious code; This is not something that Bluestacks can control and the user must be responsible about what software they run within Bluestacks. (If you were using an actual Android device the same risks would apply.)