It would be interesting to see what you sent to them to provoke a blunt response. As an analogy, while Curious Labs would need to explain to you about how to render images at certain sizes and resolutions, they should not have to tell you why those various sizes and resolutions are suitable for some jobs and not for others. Likewise, they can explain to you about the import features of their program, but they shouldn't have to tell you how the Windows or Mac file structure works. It seems pretty clear to me that you were asking a question that was outside of the remit of Poser, and outside of Curious Labs' responsiblity to answer. If you kept on asking the question, in the end you were inevitably going to receive a polite but curt reply telling you you're not going to get an answer. Eventually you found the best video format for your needs by trying them out, and that really says it all. As my parents occasionally said to me when I was growing up; 'look with your eyes, not your mouth.'