PRG (Program) files are executable programs. They mostly contain software but also contain data. These files can be converted to a human readable form using a MIPS disassembler. You wont get much benefit from reading that unless you have knowledge of programming and a lot of patience. The original developer has complete freedom in how data and software are arranged. Generally the disassembler makes no attempt to separate data from the software, so a human must decide which is which.
I'm looking at the font in video memory right now. I'm trying to trace it back to where it came from on the disc. I can lift out the font for you.
June 07, 2019, 04:56:17 pm - (Auto Merged - Double Posts are not allowed before 7 days.)
The font is stored in BATTLE\SYSTEM.DAT at offset 0x1E0F0. The image is 4bit 256x96 pixels and is 0x3000 (12288) bytes in size. Each character is 12x12 pixels and they are arranged in a 21x8 grid.
There are many fonts in this file. This font appears to be a portion of a larger image containing other fonts. There is another 12x12 font immediately before this dialog font and it is also 12x12. And there is a tiny 8x8 font running vertically along one edge of the entire image, which makes use of the fact that 21 characters leaves 4 bytes (8 pixels).
The entire image is blitted to video memory in a single copy operation. The full image begins at offset 0x1ABF0 but it does not appear to have a file header. I have no idea how tall it is, only that it is at least 256x192 and not larger than 256x256. I have not found the CLUT (Color Look Up Table), so the font does not have correct colors. There appear to be many CLUT's each containing 16 colours (4-bit) but I have not found the right one.