SplutterFish's OpenEXR Bitmap I/O plug-in has been updated to work with 3ds max 6.  Plug-ins for use in versions 3, 4, 5, and 6 of 3ds max and Autodesk's VIZ software are all included in the package.  Get them at SplutterFish's free plug-ins page

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OpenEXR is the high dynamic-range (HDR) image file format developed by ILM and released as free software.  See OpenEXR.org for more info.