File | Tsukihime Save

Right-click your Tsukihime.exe shortcut and select "Open file location."

Do not lose your progress. Copy the original savedata folder to your desktop. tsukihime save file

This is a pro tip. Sometimes the game ignores new saves. Right-click the savedata folder > Properties > Uncheck "Read-only" > Apply to all subfolders. Right-click your Tsukihime