Converting them is not an option.
There's about 500 different types of game data my engine can load and each of them have about 100 BMP images, the users would have to convert every time they wanted to try some new data and it would probably mess up the original data.
There's about 500 different types of game data my engine can load and each of them have about 100 BMP images, the users would have to convert every time they wanted to try some new data and it would probably mess up the original data.