PowerShell converting System.Byte[]

hi,

have writing garbled data of our extensiondata attributes, on of our distribution lists. i'll use repadmin /showobjmeta track down offending user account in meantime i'm trying output particular attribute csv in order find out ones have been borked.

here's current command:

get-adgroup -filter * -properties extensiondata,whenchanged | where-object{$_.extensiondata -ne ""} | select distinguishedname, @{l='extensiondata'; e={$_.extensiondata -join ";"}}, whenchanged | export-csv out.csv -notypeinformation

returns dn, date object changed , extensiondata:

system.byte[]

or some:

system.byte[];system.byte[];system.byte[];system.byte[];system.byte[];system.byte[]

etc.

i'm struggling convert believe hexadecimal value readable string , hoped help.

if don't include line:

@{l='extensiondata'; e={$_.extensiondata -join ";"}}

extensiondata attrib csv shows:

"microsoft.activedirectory.management.adpropertyvaluecollection"
thanks!

a couple of these previous questions (with answers) regarding extensiondata may solve issue:

http://social.technet.microsoft.com/forums/windowsserver/en-us/755db2a9-5bf1-4112-8bce-7dc6ae307d3a/working-with-extensiondata-attribute-byte-arrays?forum=winserverpowershell

http://social.technet.microsoft.com/forums/windowsserver/en-us/16124c53-4c7f-41f2-9a56-7808198e102a/attribute-seems-to-give-byte-array-how-to-convert-to-string?forum=winserverpowershell

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