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