Any old skool programmers who can count in hexadecimal will tell you that you get a lot more "numbers" by using letters as well. Hex counts 0, 1, 2. 3, 4, 5, 6, 7, 8, 9, a, b c, d, e, f, 10, 11
It was important in it's day, when every bit of storage genuinely mattered. FF being 256 (or 255, thereabouts anyway) took 1 less bit to record than it's decimal equivalent. FFFF was 65535 which might be a number many old timers remember for a whole host of reasons. ( I think it was the max number of colours on a screen in one of the older graphics formats, then it became 16m)
I doubt that's' exactly your reason but it'll be something along those lines - with 4 letters only you have 26x26x26x26 unique filenames before you runn out, far greater than 9999. More if you use the numbers too.
I have to say, that is the least of your problems if the rest of your description is accurate!!
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Computer file name conundum new
Computer file name conundum new