VirtualBox

You need to make two folders in the same directory as the VirtualBox AppImage. One will be labeled 'VirtualBox-KVM_7.2.6-archimage5.0-x86_64.AppImage.config' and the other will be 'VirtualBox-KVM_7.2.6-archimage5.0-x86_64.AppImage.home'. The AppImage version you use doesn't matter as long as the folder names match your AppImage. It is recommended to create your virtual machine beforehand. Make sure to keep any external files placed in your 'VirtualBox-KVM_7.2.6-archimage5.0-x86_64.AppImage.home' folder you have made. Also in VirtualBox itself, export your VM as a Virtual Appliance and keep that on the cartridge as well.

For the first time setup, you'll need to relocate and import the Virtual Appliance you have made. You'll also have to relocate the folder for your Virtual Machines.