JSON extension isn't known by PSPad. PSpad opens from project known extension and unknown extensions are send to assigned application. So I don't know how did you assign PSpad to JSON. Open menu settings / JavaScript On the second tab is list of assigned extensions, add there *.json
>From this moment PSpad will know JSON extension. Clicking on your manifest will open it as any other known file directly in PSpad -- <https://forum.pspad.com/read.php?2,73145,73146> PSPad freeware editor https://www.pspad.com
