Vista - icacls Problem, any Ideas ?

Hello ppl,

i want to replace a SID on a Network Share, its an EMC Cellerra Fileserver.
The SID belongs to a non existent local Group of a Computer, and shall be
replaced with the Domain Admins.
Now the Problem is: i can see the SID when i do a icacls . /save blabla /t eg:
D:AI(A;;FA;;;S-1-5-21-843271493-14817-88053947-544)(A;ID;FA;;;S-1-5-21-3293502084-2983367093-3279364434-3974)(A;ID;FA;;;DA)
../\gempc.doc
its the first SID.
Now i can do a search fo my own SID by Number:
icacls . /findSID *S-1-5-21-3293502084-2983367093-3279364434-3974 /t
and it is found. now i do a search for the SID to be replaced:
icacls ./ /findSID *S-1-5-21-843271493-14817-88053947-544 /t
Es wurde keine Dateien mit übereinstimmender SID gefunden. <-- none is found

how can that be ? what do i do wrong ? my own SID is inherited, the other is
added explcitely

thanks for hints

Well i have those SIDs in various locations. Only the Share for users
homefolders has >700k folders alone. If i would know icacls could search and
replace this SID i would give icacls like 2 Days of work.....