How to open 32 bit PNG with unpremultiplied alpha?

Question

I've got the latest Photoshop CC (2014) and I've been trying to figure out how to import a 32 bit PNG file with an embedded but unpremultiplied alpha channel in it.  So this is a PNG image with four channels:  Red, Green, Blue, and Alpha.  Unfortunately, when I open it in PS, I get a three channel (R, G, B) image where PS has cheerfully premultiplied the alpha into the other channels, as you can see here:
The "glow" is the Alpha channel's unwanted effect.
I know the Alpha channel is still there because if choose Channel-->Split, I get four grayscale images:  myimage_red, myimage_green, myimage_blue, and myimage_transparency.    So the Alpha information is being kept separate, but PS is being "helpful" and premultiplying it on the open.
Is there a setting or anything else that can overcome this behavior?
Note:  The reason for this is that I'm using the "alpha" channel for something else (ambient occlusion) in a CG program and it should not be being used for transparency at this point.   (Long story.)

Answer 1

Thank you for your prompt response!   I apologize if I misused the term "premultiplied."   Here's what I am familiar with the term from:   https://helpx.adobe.com/premiere-pro/using/compositing-alpha-channels-adjusting-clip.html
With straight (or unmatted) channels, transparency information is stored only in the alpha channel, not in any of the visible color channels. With straight channels, the effects of transparency aren’t visible until the image is displayed in an application that supports straight channels.
With premultiplied (or matted) channels, transparency information is stored in the alpha channel and also in the visible RGB channels, which are multiplied with a background color. The colors of semitransparent areas, such as feathered edges, are shifted toward the background color in proportion to their degree of transparency.
So, here is what I see on my Photoshop screen when I open this image.  Note that there are only THREE channels displayed, Red, Green and Blue (and the composite RGB channel).  All three of them display transparency, allowing the (in this case checkered) background to show through:
Now, if I select Channels-->Split Channels I get these FOUR images.   Note that there is a "Transparency" channel which has my separate information that I want, and there are three color channels, none of which display transparency.   This is what I meant by "premultiplied".   In the default mode above, Photoshop has "multiplied" each color channel by the "Transparency" channel.   This is the behavior I was seeking to avoid.    Can you offer any further advice on how to prevent this automatic use of the "Transparency" layers, or is this something that Photoshop does not support at this time?
"Transparency"
  "Blue"
  "Green"
  "Red"