REG EXPORT "HKCU\Software\Raptisoft\Hamsterball" "path\to\your\file.reg"
REG IMPORT "path\to\your\file.reg"

regedit /e "path\to\your\file.reg" "HKCU\Software\Raptisoft\Hamsterball"
regedit /s "path\to\your\file.reg"