DownLevelDaemon and usgthrsvc

Hello,

Do you know what is DownLevelDaemon?

SearchProtocol pid: 2696
Command line : "C:\WINDOWS\system32\SearchProtocolHost.exe" Global\UsGthrFltPipeMssGthrPipe14_ Global\UsGthrCtrlFltPipeMssGthrPipe14 1 -2147483646 "Software\Microsoft\Windows Search" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT; MS Search 4.0 Robot)" "C:\ProgramData\Microsoft\Search\Data\Temp\usgthrsvc" "DownLevelDaemon"

Thanks.