What do you mean use them in Poser now?

I have always been loading 10K or higher textures into my Environment sphere - I can't remember ever having trouble with one. The earliest Poser I still have installed is Poser Pro 2010 and I just tried it again - loaded a 10K by 5K texture no problem.

Maybe there was a limit some time in the past, but I can't find any hard evidence of it. There are tons of people on this forum and others who claim certain things without ever citing their source. I suspect this was one of those misunderstandings that's been repeated endlessly. Probably somebody was talking about OpenGL or something, not Firefly.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)