It provides good support for Windows NT 4.0 through to Windows 10 (including XP and 7) but isn’t optimized for Windows 98. VirtualBox is a completely free and open source virtualization software from Oracle, available for Windows, Linux, macOS and Solaris. If you’re keen on going down the virtualization route, you’ll want to use one of these solutions (or to check out our other favorite virtual machine apps for Mac). Lastly, you will need a valid copy of the operating system you’re trying to install. MacBook users may also struggle with space allotment, as you’ll need to give your VM some hard drive space to function like a real computer.
For this reason, older versions of Windows (like Windows 98) can run better than more modern versions like Windows 7 or 10.
It’s also quite draining in terms of processing power and available memory to run two operating systems at once, as you’ll need to provide the VM with a portion of your available power.
Once Terminal is open, input the following command but replace home/username/disk.cdr with the path to the file you created with Disk Utility, and home/username/disk.iso with the destination path and name for the ISO file you want to create: hdiutil convert /home/username/disk.cdr -format UDTO -o /home/username/disk.iso. You’ll find Terminal in Applications > Utilities, or just search for it using Spotlight (or a Spotlight alternative). You can convert a CDR file to ISO using a quick Terminal command. The file needs to be in ISO format though to use most of the methods to play it below. You’ll be left with a CDR file that will mount on your Mac like a hard drive or DMG file. 
Click Save, disabled, and begin the process. Make sure you select "DVD/CD master" in the Format dropdown, and ensure Encryption is set to none.
Name your file and select where you want to save it. Head to File > New Image > Image From "Device" and choose your optical drive. Insert your CD or DVD into your optical drive, and launch Disk Utility. If you do have a SuperDrive, or you’re using a Mac that is blessed (cursed?) with an optical drive, here’s how to extract a disk image and convert it to an ISO disk image file: For quickness, you might want to just use disk images though, which contain all the data found on a CD or DVD as a file stored on your computer. Apple sells an external optical USB SuperDrive that will allow you to use your original CDs and DVDs to play games.
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