Tileset tsr file question

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1. I am very glad that my help was useful to you.
2. You need to make a tsr <-> png converter, it is quite possible. But it is necessary to disassemble the beginning of the file - as I said, most likely there is a table indicating the sizes and offsets of tiles. If this is the case, then it is quite possible to change the resolution of textures.
3. otherwise, if there are no records about the resolution of textures (for example, if this resolution is sewn into .exe) - only change them in the old resolution. In this case, it is enough to make a distillation from offset 12910 (hex) to png with a color depth of 24 and back. In tsr, the color is stored as BGR depth 24.