There are 2 problems 1. Switch off skin if youbusevthe dark to Windows skin. 2. Integration must be set to DLL, not a registry. With registry integration, windows starts PSPad instance for each file. If you select and open 4 files, 4 PSPad are started and must send files to first one.
-- <https://forum.pspad.com/read.php?4,73614,73617> PSPad freeware editor https://www.pspad.com
