convert .psb to .psd

[iDad]

convert .psb to .psd
Is it possible? I need it as png but I believes it need to be converted to .psg first,I have no option to do that on this file
can I just change extention?

 

[hawkeye]

Size limit for psd is 30000 X 30000. As long as the file size is less than that you can convert to psd.

 

[iDad]

triple that size lol it's coverting now, maybe by tomorrow it will be done ..ugh....... thanks!