Here's a screenshot on OS10.4.9 which gives a stop/continue dialog with the same text.
http://www.flickr.com/photos/56953868@N00/435542840/
(options are still incomplete - IMO)
Taken from WTF:
Instructions for reproducing the error on a Mac whose boot drive is formatted as normal (i.e. case-insensitive) HFS+:
(note that this will replace any file named "CaseSensitiveTest.dmg" on your desktop, if you have one and it isn't already open):
Open Terminal and type the following (on one line, if it comes through as two):
hdiutil create -size 5m -fs HFSX -volname CaseSensitiveTest -ov -attach ~/Desktop/CaseSensitiveTest.dmg
This will create and mount a case-sensitive disk image (a 5 MB case-sensitive non-journaling HFS+ volume, if you must know) whose volume name is "CaseSensitiveTest". Now copy a small file onto the disk image, then open the disk image, duplicate the file, and give the copy a name which is identical to the original, but with a different set of cases. Now drag both files onto the desktop. You will get an error from the Finder which has the exact same icon and message as shown.