System Files

The System Files category includes files related to Mac, Windows, and Linux operating systems. Some examples include system libraries, icons, themes, and device drivers. Files output by the system are also included in this category.

Common system file extensions include .DLL, .DRV, .SYS, and .CAB.

Extension File Type Popularity
.LOCKFILEMac OS X PLIST Lock File
.REGRegistry File
.AMLACPI Machine Language File
.ADMXGroup Policy Administrative Template File
.VGAVGA Display Driver
.SHSH2iOS SHSH Blob
.CURWindows Cursor
.REGTRANS-MSRegistry Transaction Log File
.RMTRouter Firmware File
.ANIWindows Animated Cursor
.SEARCHCONNECTOR-MSWindows Search Connector File
.CLBCOM+ Catalog File
.ICONPACKAGEIconPackager Theme File
.HTTHypertext Template
.ICNSmacOS Icon Resource
.DLLDynamic Link Library
.WDGTDashboard Widget
.NTWindows NT Startup File
.DESKTHEMEPACKWindows 8 Desktop Theme Pack File
.INF_LOCWindows Driver Information Cache File
.HVEWindows Registry Hive File
.DMPWindows Memory Dump
.PK2Silkroad Online Game Data File
.LNKWindows Shortcut
.DVDDOS Device Driver
.VX_Compressed Virtual Device Driver File
.THEMEMicrosoft Plus! Desktop Theme
.ITEMDATA-MSWindows 8 Start Screen Item Data File
.QVMQ Virtual Machine
.RC1Samsung Mobile Device Firmware File
.MDMPWindows Minidump
.EBDWindows EBD System File
.FTFFlashTool Firmware File
.DESKLINKDesktop Shortcut
.LIBRARY-MSWindows Library Description File
.SYSWindows System File
.NFOSystem Information File
.73UTI-73 Explorer Operating System File
.HIVWindows Registry Hive File
.SFCACHEReadyBoost Cache File
.PROPAndroid Build Properties File
.ASECAndroid Secure Application File
.ICOIcon File
.IONFile Description File
.FIRMBoot9Strap 3DS Firmware File
.PCKSystem Center Configuration Manager Package File
.H1SWindows Assistance Platform Help File
.ELFExecutable and Linkable Format File
.MANIFESTWindows Application Manifest File
.000Indexing Service Data File
.MUIMultilingual User Interface File
.SCRWindows Screensaver
.ETLMicrosoft Event Trace Log File
.SERVICESystemd Service Unit File
.FFXMicrosoft Find Fast Index
.CGZLinux Drivers Archive
.CIWindows Content Indexer Catalog File
.PWLWindows Password List
.BINRouter Firmware File
.MENUmacOS Menu Extra
.NLTWindows Transliteration File
.TIMERSystemd Unit Configuration File
.ZONE.IDENTIFIERWindows Zone Identifier File
.EDJEnlightenment Theme File
.MODGRUB Module
.PREFPANEMac OS X System Preference Pane
.MAPIMAILSend To Mail Recipient
.DATWindows Registry Hive File
.MSCMicrosoft Management Console Snap-in Control File
.BASH_HISTORYBash History File
.ADMAdministrative Template File
.CM0013Samsung Smart TV Index File
.CABWindows Cabinet File
.EFIExtensible Firmware Interface File
.FXReadyBoot Trace File
.WDFWindows Driver Foundation File
.MLCMicrosoft Language Interface Pack
.LFSSamsung Phone params.lfs File
.MSSTYLESWindows XP Style
.FOTAFirmware Over-the-Air File
.LOG1Windows Registry Hive Log File
.PNFPrecompiled INF File
.SDBCustom Application Compatibility Database
.PATDiskStation Manager Installation File
.SYSMotorola Driver File
.PITSamsung Phone Firmware File
.BASH_PROFILEBash Interactive Login Shell File
.C32Syslinux COM32 Module
.MOBILECONFIGApple Mobile Configuration File
.TRX_DLLWindows Startup File
.DRVDevice Driver
.MTZMIUI Theme
.MBRMaster Boot Record File
.HHKHTML Help Index
.WEBPNPWeb Point and Print File
.SBNCisco IP Phone Firmware File
.GROUPWindows Contacts Group File
.0Shared Library Link File
.MSPWindows Installer Patch
.208ASUS Notebook BIOS 208 Update File
.BCDWindows Boot Configuration Data File
.BASHRCBash Non-Interactive Login Shell File
.DITActive Directory Information Tree File
.INSInternet Naming Service File
.3FSPuppy Linux Save State File
.IMG3iPhone IMG3 File
.DEVWindows Device Driver File
.MUI_CCCD5AE0Hid User Library
.IOPLISTMac OS X IOPLIST File
.PDRWindows Port Driver
.PLASMOIDPlasma Widget
.PROTurboIntegrator Process Definition File
.DTHUMBAndroid Data Thumbnail
.DIAGCABTroubleshooting Pack Cabinet File
.HDMPWindows Heap Dump
.CPLWindows Control Panel Item
.MBNMulti Boot Image
.DRPMDelta RPM File
.POLWindows Policy File
.CATWindows Catalog File
.AOSARCHOS PCtablet Firmware File
.SHDWindows Print Job Shadow File
.NB0Device Boot Loader Image
.PPDPostScript Printer Description File
.SDTSiemens Desktop Theme File
.AXDirectShow Filter
.CANNEDSEARCHApple Predefined Search
.CHSWindows Chinese Noise-Word List File
.BIOBIOS File
.VXDVirtual Device Driver
.SAVEDSEARCHSpotlight Saved Search
.1Unix Section 1 Manual Page
.NLSMicrosoft National Language Support File
.JOBWindows Task Scheduler Job File
.CNTHelp Contents File
.WPXPrinter Description File
.SBFAndroid System File
.8CUTI-84 Plus C Operating System File
.ADMLGroup Policy Language-Specific Administrative Template
.KEXTMac OS X Kernel Extension
.FPBFMac OS X Burn Folder
.CM0012Configuration Management File
.HLPWindows Help File
.LSTGRUB Boot List File
.IDXIndex File
.8XUTI-83 and TI-84 Plus Operating System File
.PRFWindows System File
.CRASHMac OS X Crash Log File
.CONFIGPROFILEApple Configuration Profile
.SQMService Quality Monitoring File
.CHGWindows Net Logon File
.SCHEMASGConf Schema Definition File
.DFUiOS DFU File
.PANICKernel Panic File
.IMEWindows Input Method Editor File
.4Unix Section 4 Manual Page
.LEXSpelling Dictionary File
.TDZDrobo Firmware File
.WLUWindows Legacy Update
.KSKickstart File
.WERWindows Error Report
.CPQCompaq OEM Disc Configuration File
.GRPWindows Program Manager Group
.SWPSwap File
.SHSHiPhone/iPod Touch SHSH Blob File
.386Windows Virtual Device Driver
.2FSPuppy Linux Save State File
.ODEXOptimized Dalvik Executable
.PROFILEBash Shell Profile
.LOG2Windows Registry Hive Log 2 File
.BLFCLFS Base Log File
.SAVERMac OS X Screen Saver
.PS2Microsoft Search Catalog Index File
.NTFSNTFS Partition File
.HCDSamsung Android Firmware File
.HHCHTML Help Table of Contents
.ADVAudio Driver File
.DATABASE_UUIDAndroid Stale Thumbnails Identifier
.KOLinux Kernel Module File
.CHKNetgear Router Firmware File
.DIMAXDiMAX Firmware Image File
.IM4PIMG4 Payload File
.IPODRockbox Firmware File
.PROVISIONPROFILEApple Provision Profile
.THAWindows Thai Noise-Words List File
.PRINTEREXPORTWindows Printer Migration File
.METADATA_NEVER_INDEXSpotlight Never Index File
.ICLWindows Icon Library File
.FLGPuppy Linux Partition Flag File
.PFXPKCS #12 Certificate File
.BMKWindows Help Bookmarks
.CHTWindows Chinese Traditional Noise-Word List File
.CPICodepage Information File
.ATAHDATA Hard Drive Flag File
.BOMMac OS X Bill of Materials File
.NBHROM Update Utility Image File
.MSSTYLEWindows XP Unsigned Style
.FFOFind Fast Document Properties Cache
.MI4Audio Player Firmware File
.RUFSamsung DVD and Blu-ray Player Firmware File
.PIDCreative Driver File
.XRM-MSMicrosoft Security Certificate
.PRTPrinter Driver File
.STRWindows Screensaver File
.EVTXWindows 7 Event Log File
.CUSTOMDESTINATIONS-MSWindows Jump List File
.CAPASUS BIOS Update File
.MYDOCSSend To My Documents
.BK2Windows Indexing Service Data File
.SPLWindows Print Spool File
.MUMWindows Vista Update Package
.CPRWindows Phone Display Settings File
.PS1Microsoft Indexing Service Data File
.THUMBNAILSAndroid Thumbnails Folder
.RFWRockchip Firmware File
.TBRESMicrosoft Store TokenBroker Cache File
.KCmacOS Kernel Extension Boot File
.SPRXSigned PlayStation Relocatable Executable
.SCFWindows Explorer Command
.HPJHelp Project File
.SINSony Xperia Firmware File
.CMOASUS BIOS File
.MEPuppy Linux Partition Flag File
.HSHWindows Catalog Search Index File
.WGZS60 Web Runtime Widget Package
.OZIPOPPO Smartphone Firmware Update
.BK1Windows Indexing Service File
.DLXRenamed DLL File
.FTRIRIX File Type Rules File
.EVTWindows Event Viewer Log File
.KDZLG Mobile Device Firmware
.UTVSmartCast TV Firmware Update
.EFIRESEFI Image File
.IFWINTUS Firmware File
.MUNWindows System Resource Archive
.B84TI-84 Plus CE Bundle Image
.DIAGPKGTroubleshooting Pack File
.UCEWindows UCE System File
.GMMPWCS Gamut Map Model Profile
.0Android CA Digital Certificate
.ESCOPYES File Explorer File Manager Temporary File
.MEMParallels Desktop Memory Dump File
.XFBXserve RAID Firmware Binary File
.NETWORKCONNECTApple Network Connect Document
.SO.0Unix Shared Library File
.SCAPEFI Firmware File
.GRLWindows Update Status File
.DSSDCC Active Designer File
.FL1Lenovo BIOS Update File
.FFAFind Fast Status File
.LPDLPD Daemon Print Permissions File
.AUTOMATICDESTINATIONS-MSWindows Jump List File
.KBDKeyboard Layout Script
.DEVICEMETADATA-MSDevice Metadata Package
.TRASHESmacOS USB Flash Drive Trash Folder
.KEYAndroid Passcode File
.PPMPost Programmable Memory File
.RC2Samsung Mobile Device Firmware File
.VDEXValidated Dalvik Executable File
.LMLanguage Model File
.FTSFull Text Search
.DOCKMac OS X Dock Extra
.JETKEYiOS Support Jet File
.IDIEVA Controller Event Log
.SBSlax Bundle
.VGDGeneric CADD VGA Driver
.BUDBinary Printer Description File
.KWIToyota Entune Update File
.IPTHEMEIconPackager Raw Theme File
.DIAGCFGTroubleshooting Pack Configuration File
.RCOPlayStation Portable Resource File
.DICWindows 10 Custom Spelling Dictionary
.WPHPhoenix BIOS File
.2Unix Section 2 Manual Page
.LPDLookout Protocol Driver File
.6Unix Section 6 Manual Page
.5Unix Section 5 Manual Page
.PUSH_DEVICEIDAndroid Device Identification File
.QKYQuirky Kernel
.RSWindows Rating System File
.DYCXerox Printer Driver Configuration File
.JPNWindows Japanese Noise-Word List File
.KLAndroid Key Layout File
.3Unix Section 3 Manual Page
.LOCALIZEDmacOS Directory Localization File
.FIDMicrosoft Catalog Indexing Service File
.TASony Firmware File
.INTERNETCONNECTApple Internet Connect Document
.SPXSystem Profiler XML Report
.RCVBIOS Recovery File
.TCO2TI-Nspire CX II Operating System File
.EMERALDEmerald Theme
.FFLFind Fast Document List
.MMVMagnex Firmware File
.TRASHINFOLinux Trash Metadata File
.CDMPWCS Device Model Profile
.89UTI-89 Titanium Operating System File
.ROKURoku TV Firmware Update
.ITSInternet Document Set
.7Unix Section 7 Manual Page
.B83TI-83 Premium CE Bundle Image
.DUBWindows Spelling Dictionary Identifier
.BBFWApple Baseband Firmware Update
.KORWindows Korean Noise-Words List File
.IUSInfoTMIC Firmware Update File
.FTGFull Text Group
.ANNWindows Help Annotations
.REGLNKRegistry Editor Shortcut File
.8Unix Section 8 Manual Page
.HELPMac OS X Help Book
.DIFFBASEWindows Diagnostics Tracking Diffbase File
.RVPSharp Blu-ray Player Firmware File
.SELFSigned Executable and Linkable Format
.SEFWSecure Element Firmware