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As for turning pictures back to .aghs:
1. place the .png in resources-override (preferable with the correct name.)
2. start up istaria.
3. use the command : "/aghConvert [Filename+extension (ie. Face_01.png)]" and it should be converted back properly.
You can use /purgetex to force every texture to reload, which makes sure that you don't have to relog every time.
(purgetex only works if you have a file with the exact name in resources-override that you want to edit before converting, so take a dummy file, give it the proper name, log-in, aghConvert, remove dummy file and rename proper file, purgetex to check without having to relog a single time)
Another neat trick is if you have to convert a large number of files (repeatedly) you can also just chain up a text command macro(/hotkey binding) with
"/aghConvert [file1]
/aghConvert [file2]
/aghConvert [file3]
etc."
and it'll save you a lot of typing/copy-pasting