Upload the file to VirusTotal. A high-quality Ghost64.exe should have 0 detections. If you see 1 or 2 heuristic detections (e.g., "HackTool.Ghost"), that is often a false positive due to its low-level disk access. However, if you see 10+ detections (including Trojans), it is garbage.
Before using Ghost64.exe on production hardware, execute it inside a Windows Sandbox or a VM with no network access. Monitor its behavior via Process Monitor (ProcMon). A high-quality version will only access disk sectors and memory; it will never attempt outbound network connections to random IPs.
Navigate to your external hard drive. Select a folder and name your image file.
Navigate to the folder containing your tools in the WinPE environment. Locate Ghost64.exe and launch it.