SetRegion came out over 20 years ago and wad11656 has just recently decided to add a GUI to it, now you are probably wondering why someone would bother adding a GUI to a very old application, the developer gives his reasoning here:

Primarily used today to fix/increase certain PS1 games’ compatibility on the PSP & Vita-Adrenaline PS1 emulators.

Here is an explanation of what SetRegion actually does:

Converts the region sectors of PS1 .bin disc images into JAP, PAL, or USA without modifying the game’s display resolution.

There is a whole history to why the developer created this GUI and you can read it at the bottom of the source page:

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