I don't have RealBand, so I don't know how it uses QuickTime, but I do know that Apple stopped updating QuickTime for Windows over 4 years ago, and it has KNOWN vulnerabilities. The recommendation back then was to uninstall it, which I did. Be careful!

From a post in April, 2016 on ExtremeTech.com

Last week, news broke of security woes in the Windows version of QuickTime that Apple had no intention of patching. Apple has now confirmed that it has ceased developing QuickTime for Windows and will not offer security patches for the issues. The impact on PC users will depend on which software packages you use, but one major vendor, Adobe, has noted that there are certain file formats it can’t support yet without relying on Apple’s QuickTime.


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