I use Honeyview for reading manga on PC and showing all other image formats. It also supports compressed file formats.
I looked it up and it also supports bpg files since the last update.
Here is the Link.
You can try it out and tell us your experience.
Hi, Ryzen. Could you please update these games to their final updates? 星天の魔女 to [v25.06.07 (v1.18)] ドラゴンブラッド to [v25.06.01 (v1.26)] (the devs forgot to renew the update log for this one, but it got updated)
Sorry again for adding to the list, but you're the only one left with this. Please reupload when you have the time, thanks. みずカノ
Also, could you update this to Ver1.31? It wasn't listed, but it definitely got updated. 隷属と解放のラビリンス