From the Adobe website ...
"The supplemental OpenEXR Alpha plug-in provides an alternate method
for handling ‘A’ channel data when opening an OpenEXR file. Instead of
directly converting ‘A’ channel data to transparency (as the old
OpenEXR plug-in does), OpenEXR Alpha opens ‘A’ channel data as an
alpha channel."
http://kb2.adobe.com/cps/883/cpsid_88310.html
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