[fysiks]

The executablePath needs to include the executable itself. So, on Windows, it would need to end with "amxxpc.exe". So, your full path should be:

X:\MyPrograms\Steam\steamapps\common\Half-Life\cstrike\addons\amxmodx\scripting\amxxpc. exe

If you manually edit the JSON file directly, you need to escape the backslashes (i.e. \\).