Thank you bro~ ,everything is alright now ,i think i got my problem fixed.
To fix that error("%1 Not a valid Win32 bit application") ,
The easy solution ,just go find (x64) .dll plugin's version ,download it and replace those plugins to the original path,
then those (x64) .dll plugins just return to the right track and working again with MeGUI (64bit)~!!
THANKS FOR YOUR HELP 'my developer bro'~hope you have a nice day ~~.get luck with everthing~.
Are you sure you're not feeding 32-bit MeGui with 64-bit script?