Here is test build: http://pspad.poradna.net/devel/pspad500b262.zip
When you open file (context menu or TC or ..) and PSPad is running PSPad will show you message with file and information "Message sent". Running instance sould show you information "Message received" with name of the file. Can you test it please? -- <https://forum.pspad.com/read.php?6,69840,69862> PSPad freeware editor https://www.pspad.com
