What are System Files?

The System File format is used to store critical computer data to be used by an operating system. Some examples include device drivers, system libraries, and other critical configuration details. Important to the functioning of the operating system, companies like Microsoft also implement certain precautions like applying a system attribute to prevent accidental deletion of such files.

Popular System File Extensions


System File Types

File Database Breakdown - System File Extensions


Top System File Extensions

File Extension Total Number of Files Oldest File (Date) Latest File (Date)
DESKLINK 7 Desktop (create shortcut).DeskLink
(09/18/2006)
Desktop (create shortcut).DeskLink
(03/04/2020)
ITEMDATA-MS 4 appsFolder.itemdata-ms
(04/24/2017)
appsFolder.itemdata-ms
(05/10/2017)
HHK 20 scoped_9.hhk
(04/24/2017)
Index.hhk
(11/28/2019)
BR2 1 M1033Eva.BR2
(03/18/2017)
M1033Eva.BR2
(03/18/2017)
DYC 38 XB55X_A.DYC
(09/18/2006)
XWA55X_A.DYC
(09/18/2006)
EVTX 82929 Microsoft-Windows-WorkFolders%4WHC.evtx
(04/24/2017)
Microsoft-Windows-Windows Defender%4Operational.evtx
(03/30/2020)
AUTOMATICDESTINATIONS-MS 6 f01b4d95cf55d32a.automaticDestinations-ms
(04/24/2017)
5f7b5f1e01b83767.automaticDestinations-ms
(04/24/2017)
CUSTOMDESTINATIONS-MS 9 f01b4d95cf55d32a.customDestinations-ms
(04/24/2017)
f01b4d95cf55d32a.customDestinations-ms
(04/24/2017)
DBL 5 wpa.dbl
(04/24/2017)
wpa.dbl
(08/29/2019)
TASKS 8 Microsoft.Common.Tasks
(01/21/2008)
Microsoft.Common.Tasks
(10/05/2019)
LIBRARY-MS 39 RecordedTV.library-ms
(07/14/2009)
Documents.library-ms
(11/23/2019)
EBD 6 systemsf.ebd
(04/11/2009)
ResPriStaticDb.ebd
(04/24/2017)
UCE 48 ShiftJIS.uce
(11/02/2006)
bopomofo.uce
(03/18/2017)
DIAGPKG 74 DiagPackage.diagpkg
(07/13/2009)
DiagPackage.diagpkg
(03/18/2017)
ESN 3 wbdbase.esn
(04/14/2008)
wbdbase.esn
(04/14/2008)
PPD 1661 BRH145_2.PPD
(09/18/2006)
MSXPSINC.PPD
(03/04/2020)
OVERRIDETASKS 3 Microsoft.Common.OverrideTasks
(06/02/2012)
Microsoft.Common.OverrideTasks
(03/18/2017)
IEM 4 inetcorp.iem
(11/02/2006)
inetset.iem
(04/12/2011)
ITS 128 MSB1ESEN.ITS
(05/10/2017)
MSB1FREN.ITS
(03/04/2020)
GID 17 vba_acc.GID
(05/10/2017)
Wspelldlg.GID
(01/10/2020)
NLD 3 wbdbase.nld
(04/14/2008)
wbdbase.nld
(04/14/2008)
FTG 1 VBAACCSP.FTG
(05/10/2017)
VBAACCSP.FTG
(05/10/2017)
XRM-MS 6933 MicrosoftWindowsSafeDocsMain-ppdlic.xrm-ms
(01/21/2008)
osppobjs-spp-plugin-manifest-signed.xrm-ms
(03/04/2020)
FTS 6 VBAACCSP.FTS
(05/10/2017)
BS9532.FTS
(05/10/2017)
ADML 19361 WindowsMediaPlayer.adml
(11/02/2006)
OneDrive.adml
(03/30/2020)
CNT 98 CNBJHLP2.CNT
(09/18/2006)
speech.cnt
(03/05/2020)
JPN 5 noise.jpn
(09/18/2006)
SmartVCD.Jpn
(11/25/2019)
GMMP 20 Graphics.gmmp
(09/18/2006)
Graphics.gmmp
(03/18/2017)
SEARCHCONNECTOR-MS 12 connectedsearch-protocol.searchconnector-ms
(06/18/2013)
Microsoft Office Outlook.searchconnector-ms
(02/15/2020)
SETTINGCONTENT-MS 604 AAA_SystemSettings_PCSystem_PenAndTouchStatus.settingcontent-ms
(07/24/2013)
NameSpace_Classic_0_FlashPlayerCPLApp.cpl.settingcontent-ms
(04/24/2017)
NT 8 autoexec.nt
(04/14/2008)
config.nt
(04/24/2017)
PROFILE 9 WWAHost_AppexSports.profile
(07/26/2012)
StandardProfileL3.Profile
(12/02/2019)
MAPIMAIL 7 Mail Recipient.MAPIMail
(09/18/2006)
Mail Recipient.MAPIMail
(03/04/2020)
GRL 6 Active.GRL
(11/02/2006)
Active.GRL
(03/18/2017)
MYDOCS 6 My Documents.mydocs
(04/24/2017)
Documents.mydocs
(04/24/2017)
CHS 6 NOISE.CHS
(09/18/2006)
extension.chs
(01/02/2020)
CLB 12 R000000000001.clb
(09/18/2006)
R000000000005.clb
(02/21/2020)
ANI 173 drum.ani
(11/02/2006)
pdf2html.ani
(02/12/2020)
EFTX 592 Urban.eftx
(05/10/2017)
Thatch.eftx
(03/04/2020)
CDMP 10 wscRGB.cdmp
(09/18/2006)
wscRGB.cdmp
(03/18/2017)
THEME 76 Windows Classic.theme
(09/18/2006)
index.theme
(01/13/2020)
PROPDESC 35 ie8props.propdesc
(11/21/2010)
VisioCustom.propdesc
(03/04/2020)
CUR 1353 move_il.cur
(09/18/2006)
MoveSticker.cur
(02/11/2020)
VXD 13 dsound.vxd
(04/14/2008)
ndphlpr.vxd
(02/21/2020)
BLF 2 KtmRmTm.blf
(04/24/2017)
KtmRmTm.blf
(05/10/2017)
CI 17 00010001.ci
(04/24/2017)
extension.ci
(01/02/2020)
IDX 48 M1033DSK.IDX
(09/18/2006)
psanbla.idx
(03/05/2020)
WPRP 1 provtrace.wprp
(03/18/2017)
provtrace.wprp
(03/18/2017)
CWL 1 SAMPLE1.CWL
(05/10/2017)
SAMPLE1.CWL
(05/10/2017)
ADM 30 inetres.adm
(04/14/2008)
AER_1033.ADM
(01/29/2020)
HTT 14 PUBPLACE.HTT
(04/24/2003)
eTransmit.htt
(01/20/2020)
ADMX 2011 WindowsMediaDRM.admx
(11/02/2006)
OneDrive.admx
(03/30/2020)
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