It sounds like you’re looking for a (Virtual Hard Disk) file — possibly for testing, development, or running inside a virtual machine like Hyper‑V, VirtualBox, or VMware.
to mount your newly created VHD and run Windows 8.1 natively without extra software. needed to convert that ISO into a VHD? Windows 8.1-Create a VHD and Install Windows On It 30 Nov 2013 —
: It runs smoothly on as little as 2GB of RAM and older HDD storage, making it an excellent choice for lightweight virtual machines. VHD vs. Physical