Opening HDR files in CS4 Standard

I am trying to write a document that gives simple, standard instructions to users on what to do when opening HDR files in Photoshop CS4 Standard (Windows XP SP3). The files are generated by 3D Studio Max V-Ray in the EXR format. The problem is that gamma levels are frequently off for users, so the instructions are meant to simplify things for them. Through some testing, I discovered something I don't understand:
With RGB color management policy set to 'Preserve Embedded Profiles' (and it doesn't matter what the actual RGB profile is and/or whether or not any of the 'Ask When...' boxes are selected), the EXR opens as expected and no gamma correction is needed
With RGB color management policy set to 'Convert to Working RGB' (and it doesn't matter what the actual RGB profile is), selecting the 'Ask When...' boxes causes the EXR to open as expected also...but if one does NOT select the 'Ask When...' boxes and allows Photoshop to automatically convert, the image is very dark and requires a gamma correction layer.
I ran all possible scenarios of 'Preserve Embedded Profiles' and 'Convert to Working RGB' with 'Ask When...' boxes selected and deselected in Photoshop CS3 Extended and all images opened as expected with no need for gamma correction.
Can anybody shed light on this oddity? Is there a limitation in Photoshop Standard when it comes to HDR image processing? Or is this a change from either Standard or Extended version from CS3 to CS4?

Hmm, that is odd, and I don't recall hearing about problems like that from other users.
Photoshop always treats 32 bit/channel data as gamma 1.0, and always corrects for the display.
If you send me one of the files in question, I can take a look.
Photoshop CS45 Standard is only limited in 32 bit/channel in that it can't create layers or use many of the brush tools.
But Photoshop CS5 no longer has that limitation.

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