Indexing Service is no longer supported as of Windows XP and is unavailable for use as of Windows 8. Instead, use Windows Search for client side search and Microsoft Search Server Express for server side search.
The SecPropertyStoreMappedCache entry is the maximum number of pages from the secondary property cache that are to be kept in memory at any one time.
|Range:||0 - 4294967295 (0xFFFFFFFF)|
The PropertyStoreMappedCache entry serves the same function for the primary property cache.
For more details, see PropertyStoreBackupSize.