I was getting the debugger when I chose the "more..." option from the 
FileList, in a 3.4a image with SARInstaller for 3.4 loaded from 
SqueakMap.  The DNU was caused by SARInstaller not understanding 
FileList's request for #services.
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'From Squeak3.4alpha of ''11 November 2002'' [latest update: #5109] on 19 November 2002 at 12:21:28 pm'!

!SARInstaller class methodsFor: 'class initialization' stamp: 'bkv 11/19/2002 12:19'!
services

^self fileReaderServicesForFile: nil suffix: 'sar'


! !