In Windows 7, offline files cache is by default stored in C:\windows\CSC folder. This cache location can be changed by modifying registry key CacheLocation under the node HKLM\System\CurrentControlSet\Services\CSCService\Parameters.Regkey : CacheLocation
Type: REG_SZ
Type: REG_SZ
We need to assign the path of the new location to the CacheLocation. Note that this path should be specified in NT format. For example, if you want d:csc to be the place for csc cache then you should assign the value ??d:csc to the above registry value.
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Changing Offline Files Cache Location in Windows Vista