So after some time, I was able to extract WAR files from the Visual Novel I am interested in, and I was wondering if anyone knew how to extract the S25 files and OGV files. Not only does Google not know what these file types are, I don't know what they are, and no leads on this matter. Would really greatly appreciate it if someone can give me some information on this.
Thank you!
Edit: The game is Gensou no Idea ~Oratorio Phantasm Historia~
And after some research and thanks from Moogy from tlwiki, I was able to find out the S25 and OGV files aren't meant to be extracted but decompiled. So if my understandings are correct, the s25 and ogv files are; BGs, voices, CGs, characters, and script files, etc just in the form of s25 and ogv.
tl;dr: if anyone knows how to decompile or view s25 and ogv files, or has a tool for it, it would be very much appreciated if you can help me.
Thank you Ame for letting me know to include the game title!