Suspicious Registry Entries

In this registry key:
HKEY_USERS\S-1-5-21-1202660629-507921405-854245398-1004\Software\Microsoft\Search Assistant\ACMru\5603

I have the following entry:
0?FFFF9C

And in the same place I have ]?FFFF9A

The Name of the first is 000 and the second in 001 and the type is REG_SZ.

What are these nasty things.