Dreamcast-Kita e Series .cb and .pvr

Hi everyone, I'm trying to extract texture files from two Dreamcast games—Kita e White Illumination and Kita e Photo Memories—and I'm stuck on two issues. First, for White Illumination, the .CB file (which I opened with a hex editor and found to contain .dds and .set files) was extracted using a script generated by DeepSeek, but the resulting .dds files won't open in any image viewer I've tried (see SSYF.zip). Second, for Photo Memories, the PVR files have GBIX and PVRT headers, but none of the usual tools—pvr2image, Noesis, sprt2png, or PVRTexTool—can convert or even open them (yuko_PVR.zip). I suspect the data might be compressed, encrypted, or using non‑standard headers. I know I can use the Flycast emulator to dump textures as the game runs, but that's pretty tedious. Has anyone successfully extracted these formats, or does anyone know of a working tool or script that can handle them? Any help would be greatly appreciated.

yuko_PVR.zip SSYF.zip