Test your paths in Windows Run dialog before launching SSE. If they work there, they will work in SSE.
[Launcher] Target = D:\Games\Hollow Knight\hollow_knight.exe StartIn = D:\Games\Hollow Knight (e.g., D:\My Games\Hollow Knight ), you must wrap the path in double quotes, but note the special syntax: Test your paths in Windows Run dialog before launching SSE
Target = Full path to the game .exe (with quotes if spaces exist). StartIn = Full path to the folder containing that .exe . D:\My Games\Hollow Knight )
One of the most common—and frustrating—error messages reads: This error appears the moment you click "Launch Game" in the SSE launcher window. Before you delete your game files in frustration, understand this: The problem is almost never the game itself, but rather a simple configuration error in your SmartSteamEmu.ini file. Test your paths in Windows Run dialog before launching SSE