Good evening everyone!
It's been ages since I logged last time. Maybe DAZ Studio is simply so easy to use?
Maybe... But automatic lighting with HDR use leaves me stumped... If you could be so kind and answer these questions for me?
1. What are the file requirements (size, pixel aspect, bits/channel etc.) for an environment map file to work? I tried several of them, to no avail... And I also can't seem to even open the properties of a default hdr file! (the low definition one with ruins or something).
2. Why an .exr image that I rendered in Planetside's Terragen is not working in DAZ Studio 4.8 if the dialogue box explicitly states that .exr images are supported for enviro maps?
3. Is there any free program that allows easy and reliable conversion from .exr (which I can produce) into .hdr (which I cannot) file type?
4. If everything fails, is it possible to provide automatic lighting with other file types? .png, .bmp, .tiff are preferable.
5. If above is possible, again, what are the file requirements for these files to work as enviro maps?
I ask fifth question in particular because while supplying a circular camera image in .png format, the lighting was not present at all... 
The image was simply bright, with no shadows, no directional light, and a small shading speck directly underneath my model.
Any and all help will be appreciated. 
I don't need pixel-perfect solutions mind you - the easier the answer the better. Specifically, the easiest way out for me would simply be to use other types of files instead of hdrs, until I can update my graphical programs.
I am also uploading my very, very crude spherical camera jpeg that I planned to use as a test enviro map. Unfortunatelly, I am unable to load the .exr... You can check it out and, if possible, tell me what the heck is wrong here.