Question: how to open hdr files?
Answer: How to Open an HDR File. HDR files can be opened with Adobe Photoshop, ACD Systems Canvas, HDRSoft Photomatix, and probably some other popular photo and graphics tools as well. If your HDR file isn't an image but instead an ESRI BIL Header file, you can open it with ArcGIS, GDAL, or Global Mapper.