PSPad is 32bit application. It's limited by 2GB of memory as any 32 bit's application. There is no possibility to increase heap size as you wrote. If you open big file, do several bigger operations you consume memory with undo stack.
And you are right, PSpad isn't projected to work with hundreds MB files. -- <http://forum.pspad.com/read.php?2,62895,62910> PSPad freeware editor http://www.pspad.com
