It is strongly recommended to use 78RePack only on copies of your Windows installation files, not the original, to prevent data corruption. How to Use 78RePack.exe
Choose between converting to WIM, ESD, or splitting to SWM. 78RePack.exe
If a file is placed in a 78RePack folder in the root of a drive, the tool will automatically select it on launch. It is strongly recommended to use 78RePack only
However, because 78RePack is used within technical, "scene" communities—often to modify pirated or modified ISOs—the file itself is not typically the danger, but rather the modified Windows image or the source from which it is downloaded. Safety Considerations: not the original