<http://forum.pspad.com/read.php?f=6&i=3901&t=3873> 
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[quote]Did you check [x]Editor for Total Commander ? If you moved PSPad
into different folder, please uncheck this option, Apply, check it,
Apply[/quote]
It's be disabled. Maybe cause of CAB version?.
I don't know why, for days ago, i don't care about this, all fine; but
after have problem with changing PSPad root, I re-install Windows (fresh
install, delete all Windows directory), i relized that PSPad can't
register file type on my computer.
I tried with version 2199, 2191 still error; but work fine with 2183
(old). The reason is maybe the changing of registry issue.
Please have a look.

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