No No No, Citrix do not support publishing Explorer.exe whether you copy it to exp2.exe or what ever, it does cause blue screens. You need to publish an internet explorerer.exe to the networked drive. I have done it loads of times. Find the iexplore.exe and publish it with a name of g drive or whatever and after the iexplore.exe bit add your mapped drive letter, I cannot check exactly here but you may have to do something like
"C:\Program Files\Intenet Explorer\iexplore.exe" "G:\"
This works and does not cause blue screens which the copy explorer does in some cases.
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Cheers
Scott