I tried to open same large file that failed on 6.0.7 and it still fails.
I've 2 different issue:
1. Open file from explorer context menu. Pspad starts, show spalsh screen and
the large file popup opens behind the splash screen that never closes
2. large file opened in viewer still show corrupted data

Here the test file I used
https://we.tl/t-rTLVZ42dfurPaPA7

-- 
<https://forum.pspad.com/read.php?6,80140,80144>
PSPad freeware editor https://www.pspad.com

Odpovedet emailem