So the Fedora Art team uses Krita in the production of the graphic for the syslinux splash because syslinux, for some odd reason, only displays 16-bit colorspace graphics properly. (8-bit graphics look really funkified. More info on the syslinux graphics specs are available in the depths of the art team wiki pages.) I noticed today when I installed Krita to finalize the RC syslinux artwork that Krita refused to open PNG files. What! A graphics app that won’t open PNG?
Anyhow, thanks to CyrilleB in #koffice, I have the solution – when you install koffice-krita on your F10 system, be sure to also install koffice-filters. You’ll be able to work with PNGs in Krita then.