virtualbox.org

I created a Mac machine running High Sierra for using Xcode on my Windows 10 computer. Firstly, I tried to create guest additions, but whenever I click on "Insert Guest Additions CD Image...", it gives me an error: Unable to insert virtual optical disk C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso Into the machine MacOSHighSierra. Also, I downloaded the extension pack for USB support, but after setting it up, Xcode still did not recognize my iPhone (or any other device plugged in that I added to the list). Thanks for your support in advance!

First of all, you posted on the "OSX Hosts" section. You do not have an OSX Host, you have a Windows Host, and unfortunately OSX guests are only supported on Apple hardware (which you do not have). See: Important notice regarding Mac OS X as Guest.

In the really rare case (0.001%) that this is actually an Apple computer, in which you have installed Windows, and you're trying to boot a legitimate OSX guest and not a Hackintosh, send me a PM and I'll remedy the situation. Be prepared to provide evidence in such a case.