Once the installation completes, you have a fully functional windows 7 qcow2 file .
If you are dual-booting Linux, you can boot your Windows 7 QCOW2 file using qemu-nbd : windows 7 qcow2 file
A QCOW2 file is a type of virtual disk image that stores data in a way that allows for efficient snapshotting, compression, and encryption. QCOW2 files are used by QEMU, an open-source emulator that can run a variety of operating systems, including Windows 7. Once the installation completes, you have a fully