I have to second this as well. The lack of support (thumbnails and in the viewer) for two of the most used file formats in the CG industry is quickly becoming a big limitation in DOpus. EXR and HDR are quickly replacing TGA, TIFF and PNG in production pipelines all over the place. These days we almost exclusively render to .exr format, and use .hdr for lighting in almost all our 3D graphics projects.