Moto:
There is a program called "multiren" (multi-rename) that should do this. Its got options to filter like "directories only", "files only", "files and directories", or just ".info files only". You can select multiple paths and, of course, select and deselect subdirectories. Make the selections of files you want converted. Save this list as "motosicons2bchanged". Apply the rename command to all your selected icon files (I think you use #? to mask, i.e. #?.info->#?.old). Not sure, something like that.. Then copy the new .info files. Theres a few multi-renaming tools on aminet.. I think thats what you need for this..