I can't even save my textures as PNG S I hate JPG and the loss that it has but I normally work In Photoshop as I working on then thing and then tif at the end. As far as opening it that would bug me as well ... I rarely use a texture as it starts. As far as the lo res ones ... the only place I have seen a difference is in extreme close ups which I normally don't do or see much point of S And there isn't that many utilities to convert the PNG for some folk S