DLL or Dynamic Link Library files are used by Windows operating systems and applications installed on them to store functions and codes that can be called on whenever required. There are hundreds of DLL files on a Windows system and several conditions that may result in DLL errors. Some of the common causes of DLL errors are:

• Missing, corrupt, or damaged DLL.
• Overwriting or deletion of one or more DLLs during program install or uninstall.
• Faulty or corrupt applications.
• Malware infections.
• Erroneous or invalid entries in the registry.

To understand DLL errors better, let’s have a look at some common DLL errors and the methods you can use to fix them. 

Msvcr71.dll Error

The Msvcr71.dll file belongs to the Microsoft Visual C Runtime library 7.1 engine that is required by Microsoft C++.NET-based Windows applications, such as Microsoft Windows Office versions 2002 and 2003 and Microsoft Visual Studio.NET versions 2002, 2003 & 2005. These applications require the Msvcr71.dll file to carry out operations such as including the functionality for drop-down menus, toolbar buttons, and scroll bars, and to control mouse operations.

Msvcr71.dll errors usually occur when the DLL file is damaged, deleted, or overwritten due to installation or removal of an application. The file may also get affected if there is a problem with an application that uses it. Additionally, registry problems and virus infections may also generate Msvcr71.dll errors on the system.

When the error occurs, error messages similar to the one displayed below may appear on your desktop.

“The application has failed to start because MSVCR71.dll was not found. Reinstalling this application may fix this problem.”

“Program_File failed because MSVCR71.dll was not found.“

Msvcp71.dll Error

The Msvcp71.Dll is another Microsoft C Runtime library file which is required by several Microsoft and non-Microsoft applications to perform various operations. Errors related to the Msvcp71.dll file may occur if this file is corrupt, damaged or missing from the system due to incorrect program install/uninstall, virus infections, and registry problems. When the Msvcp71.dll error occurs, you may encounter error messages similar to the following:

“This application has failed to start because Msvcp71.dll was not found. Re-installing the application may fix this problem.”

“Msvcp71.dll is a bad windows image. Please check against your installation diskette.”

Shell32.dll Error

The Shell32.dll is a Windows library file that contains the functions required by Windows Shell API. This DLL file helps with operations such as opening files and Web pages on your PC. Most commonly, Shell32.dll errors occur while launching the Internet Explorer Web browser or while creating or accessing a folder in Windows Explorer. These errors usually occur due to problems in the registry.

When a Shell32 error occurs you may receive an error message, similar to the one given below:

“This program has performed an illegal operation and will be shut down.”

Details:

“Program_File caused an invalid page fault in SHELL32.DLL”

The error message will close by prompting:

“There was an internal error and one of the windows you were using will be closed.”

Msoe.dll Error

The Msoe.dll is an essential file required by the Microsoft Outlook Express application. The Msoe.dll error usually occurs due to a missing Address Book (.WAB) file, or due to the existence of two versions of Outlook Express on the PC. When the error occurs, an error message similar to the one given below maybe displayed on your screen.

“Outlook Express could not be started because Msoe.dll could not be loaded"

Most of the time, this error can be resolved by reinstalling the Address Book Windows component or by completely removing Outlook Express from the system and then installing the Outlook Express version you want on your system.

Simple Tips to Prevent and Fix DLL Errors

To fix the msvcr71.dll error and other DLL errors and prevent them from occurring on the system, you can follow some of the tips while working on your PC.

• Be careful while installing and uninstalling applications and do not overwrite or delete shared DLLs that maybe required by other programs on your system.
• Avoid installing unsolicited, freeware applications that are likely to contain malicious and harmful codes.
• Keep your operating system, software programs, and device drivers up-to-date with the latest service packs, patches, and security releases.
• Perform regular registry scan and repair with the help of a reliable and efficient registry cleaner tool to ensure that registry problems do not cause errors on the system.
• Keep your antivirus and antispyware tools updated with the latest virus definition and schedule periodic full system scans to ensure that your system stays free from malicious information.

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A

a - library (unix)

.ad - screen saver data (AfterDark)

.adi - graphics (AutoCAD)

.adl - MCA adapter description library (QEMM)

.afi - Truevision bitmap graphics

.afm - Type 1 font metric ASCII data for font installer (ATM - many)

.all - format file for working pages (Always)

.all - general printer information (WordPerfect for Win)

.ani - animation (Presidio - many)

.anm - animation (Deluxe Paint Animator)

.ans - ANSI graphics (character animation)

.ans - ASCII text ANSI character set (NewWave Write)

.asc - ASCII text file

.avi - Audio Video Interleaved animation file (Video for Windows)

---

B

.bak - backup file

.bas - BASIC source code file

.bat - batch file (DOS)

.bbm - brush (Deluxe Paint)

.bbs - Bulletin Board System announce or text info file

.bch - batch process object file (dBASE Application Generator)

.bcp - Borland C++ makefile

.bdf - Bitmap Distribution Format font file (X11)

.bga - bitmap graphics

.bib - bibliography (ASCII)

.bib - database - not compatible with TeX format (Papyrus)

.bib - literature database (TeX/BibTeX)

.bif - Binary Image Format b&w graphics (Image Capture board)

.bin - binary file

.bio - OS2 BIOS

.bit - bitmap X11

.bm - BitMap graphics

.bmk - Help Bookmarks (Windows 3.x)

.bmp - BitMaP graphics (PC Paintbrush - many)

.bpt - bitmap fills file (CorelDRAW)

.btm - Batch To Memory batch file (4DOS)

.bup - backup file

---

C

.c - C source code file

.c - compressed unix file archive created by COMPACT

.c++ - C++ source code file

.cal - calendar file (Windows 3.x)

.cal - spreatsheet (SuperCalc)

.cbl - COBOL source code file

.cbm - compiled bitmap graphics (XLib)

.cbt - Computer Based Training (many)

.cc - C++ source code file

.ceg - bitmap graphics (Tempra Show - Edsun Continuous Edge Graphics)

.cga - CGA display font (Ventura Publisher)

.chk - recovered data (DOS CHKDSK)

.chk - temporary file (WordPerfect for Win)

.clp - clip art graphics (Quattro Pro)

.clp - clipboard file (Windows 3.x)

.cls - C++ class definition file

.cmd - batch file (OS/2)

.cmd - command (dBASE - Waffle)

.cmd - external command menu (1st Reader)

.cpp - C++ source code file

.cpp - presentation (CA-Cricket Presents)

.cpt - compressed Mac file archive created by COMPACT PRO (ext-pc.zip)

.cur - cursor image file (Windows 3.x)

---

D

.dat - data file in special format or ASCII

.dbd - debug info (Clarion Modula-2)

.dbg - symbolic debugging information (MS C/C++)

.dcf - disk image file

.dd - compressed Macintosh file archive created by DISKDOUBLER

.deb - DEBUG script (DOS Debug)

.def - defaults - definitions

.dem - demonstration

.dem - graphics (VistaPro)

.dgs - diagnostics

.dic - dictionary

.dir - directory file (VAX)

.diz - description file (Description In Zip)

.dlg - dialog resource script file (MS Windows SDK)

.dll - Dynamic Link Library (Windows 3.x - OS/2)

.dll - export/import filter (CorelDRAW)

.dmp - dump file (eg. screen or memory)

.doc - document text file

.dos - network driver (eg. pkt_dis.dos)

.dos - text file containing DOS specific info

.drv - device driver eg. for printer

.dsk - project desktop file (Borland C++ - Turbo Pascal)

.dss - screensaver file (DCC)

---

E

.ega - EGA display font (Ventura Publisher)

.emu - terminal emulation data (BITCOM)

.env - Enveloper macro (WOPR)

.env - environment file (WordPerfect for Win)

.err - error log

.err - error messages for command line compilers

.esh - Extended Shell batch file

.exc - REXX source code file (VM/CMS)

.exc - exclude file for Optimize (do not process) (QEMM)

.exe - directly executable program (DOS)

.exm - MSDOS executable, system-manager compliant (HP calculator)

.ext - extension file (Norton Commander)

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F

.fac - FACE graphics

.faq - Frequently Asked Questions text file

.fax - fax (raster graphics) (most Fax programs)

.fdw - form (F3 Design and Mapping)

.fix - patch file

.frm - form (Visual Basic)

.ftp - configuration (FTP Software PC/TCP)

.fx - on-line guide (FastLynx)

.fxd - phonebook (FAXit)

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G

.gbl - global definitions (VAXTPU editor)

.gfb - compressed GIF image created by GIFBLAST (gifblast.exe)

.gft - font (NeoPaint)

.gif - Graphics Interchange Format bitmap graphics (CompuShow)

.gly - glossary (MS Word)

.gph - graph (Lotus 1-2-3/G)

.gr2 - screen driver (Windows 3.x)

.grb - MS-DOS Shell Monitor file (MS-DOS 5)

.grp - group file (Windows 3.x - Papyrus)

---

H

.hlp - help information

.hof - Hall Of Fame (game scores)

.hp8 - ASCII text HP Roman8 character set (NewWave Write)

.htm - HTML document (Mosaic)

.htx - Hypertext file

---

I

.iax - bitmap graphics (IBM Image Access eXecutive)

.ibm - compressed file archive created by ARCHDOS (Internal IBM only)

.icn - ICON source code file

.ico - icon (Windows 3.x)

.id - disk identification file

.ifs - system file (OS/2) hpfs.ifs

.img - bitmap graphics (Ventura Publisher - GEM Paint)

.inc - include file (several programming languages)

.inf - information text file (ASCII)

.inf - install script

.ini - initialization file

.ins - (WordPerfect) wp51.ins

.ins - installation script (1st Reader)

---

J

.jas - graphics

.jbd - datafile (SigmaScan)

.jpc - graphics (Japan PIC)

.jpg - JPEG Joint Photography Experts Group format bitmap graphics

.jtf - graphics (TIFF file with JPEG compression)

---

K

.key - security file eg. Shareware Registration info

.kps - IBM KIPS bitmap graphics

.kyb - keyboard mapping (FTP Software PC/TCP)

---

L

.lbm - bitmap graphics (DeluxePaint)

.lbm - linear bitmap graphics (XLib)

.lcl - (FTP Software PC/TCP)

.ldb - (MS Access)

.lgo - startup logo code (Windows 3.x)

.lib - library file (several programming languages)

.lis - listing (VAX)

.log - log file

.lpc - printer driver (TEKO)

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M

.m3d - 3D animation macro

.mac - bitmap graphics (Macintosh MacPaint)

.mac - macro

.mai - mail (VAX)

.mak - makefile

.mak - project file (Visual Basic)

.man - command manual

.map - color palette

.map - format data (Micrografx Picture Publisher)

.map - linker map file

.map - map (Atlas MapMaker)

.map - network map (AccView)

.mbx - mailbox data (ZERBERUS)

.mci - MCI command script (Media Control Interface)

.mcp - printer driver (Mathcad)

.mcw - text file (MacWrite II)

.mdm - modem definition (TELIX)

.meu - menu group (DOS Shell)

.mid - standard MIDI file (music synthetizers)

.mke - makefile (MS Windows SDK)

.mod - MODULA-2 source code file (Clarion Modula-2)

.mod - Windows kernel module

.mon - monitor description (ReadMail)

.mov - movie (AutoCAD AutoFlix)

.mp2 - MPEG audio file (xing)

.mpc - calender file (MS Project)

.mpg - MPEG animation

.msg - message

.msp - bitmap graphics (Microsoft Paint)

.mst - setup script (MS Windows SDK)

.mth - math file (Derive)

.mtm - MultiTracker Module music

.mtw - datafile (Minitab)

.mu - menu (Quattro Pro)

.mus - sound file (MusicTime)

.mvf - stop frame file (AutoCAD AutoFlix)

.mvi - movie command file (AutoCAD AutoFlix)

.mvw - log file (Saber LAN)

.mxt - (MS C)

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N

.nws - info text file (latest news) (ASCII)

.nxt - sound (NeXT format)

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O

.obj - object code (Intel Recolatable Object Module)

.ocx - OLE custom control

.off - Object File Format vector graphics

.old - backup file

.ovl - overlay file (part of program to be loaded when needed)

.ovr - overlay file (part of program to be loaded when needed)

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P

.pac - STAD Image (graphics ?)

.pac - package (SBStudio II)

.pal - color palette

.par - permanent output file (Windows 3.x)

.pcc - cutout picture vector graphics (PC Paintbrush)

.pch - patch file

.pct - bitmap graphics (Macintosh b&w PICT1 - color PICT2)

.pcw - text file (PC Write)

.pcx - bitmap graphics (PC Paintbrush)

.pda - bitmap graphics

.pdv - printer driver (Paintbrush)

.pgm - Portable Grayscale bitMap graphics

.pgm - program (Signature)

.pgp - support file (Pretty Good Privacy RSA System)

.pgs - manual page (man4dos)

.pic - PIXAR picture file (SDSC Image Tool)

.pic - bitmap graphics (Macintosh b&w PICT1 - color PICT2)

.pic - bitmap graphics (many eg. Lotus 1-2-3 - PC Paint)

.pif - Program Information File (Windows 3.x)

.pif - vector graphics GDF format (IBM mainframe computers)

.pit - compressed Mac file archive created by PACKIT (unpackit.zoo)

.pll - pre-linked library (Clipper 5)

.pnt - Macintosh painting

.pop - messages index (PopMail)

.pop - pop-up menu object (dBASE Application Generator)

.prd - printer driver (many)

.pub - public key ring file (Pretty Good Privacy RSA System)

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Q

.qpr - print queue device driver (OS/2)

.qpx - compiled query program (FoxPro)

.qrt - QRT ray tracing graphics

.qry - query (dBASE IV)

.qt - QuickTime movie (animation)

.qwk - QWK reader message file

.qxd - document (QuarkXPress)

.qxl - element library (QuarkXPress)

---

R

.rdi - device-independent bitmap file (RIFF RDIB format)

.rdx - datafile (Reflex)

.rec - datafile (EpiInfo)

.rec - record file (Sprint)

.rec - recorded macro file (Windows 3.x)

.red - path info (Clarion Modula-2)

.ref - cross-reference

.reg - OLE Registration (Windows 3.x)

.reg - registration (Corel programs)

.rem - remarks

.rgb - SGI RGB image file (SDSC Image Tool)

.rif - RIFF bitmap graphics (Fractal Design Painter)

.rip - graphics (Remote Access)

.rix - bitmap graphics (ColorRIX VGA Paint)

.rmk - makefile (RMAKE)

.rpt - report

.rtf - Windows Help file script

.rtl - text file

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S

.sav - backup file (saved file)

.sav - configuration

.sav - saved game situation (eg. NetHack)

.sbd - storyboard (Storyboard Editor)

.sbi - Sound Blaster Instrument file (Creative Labs)

.sbr - support file (Source Browser)

.scc - text file

.scr - DEBUG source code file (DOS Debug)

.scr - screen saver (Windows 3.x)

.scx - bitmap graphics (ColorRIX)

.sea - Self-Extracting compressed Macintosh file Archive

.sec - secret key ring file (Pretty Good Privacy RSA System)

.sec - secured animation file (Disney Animation Studio)

.set - setup options file

.sgi - graphics (IRIS - Silicon Graphics)

.sig - current program settings (Signature)

.sig - signature file (PopMail)

.sit - compressed Macintosh archive created by STUFFIT (unsit30.zip)

.smp - sample (sound file)

.smt - text file (Smart Ware II)

.snd - digitized sound file (Macintosh/ATARI/PC)

.spl - sample

.sum - Summary

.swp - swap file (DOS)

.sys - datafile (SYGRAPH - SYSTAT - SPSS/PC)

.sys - system file - device driver or hardware configuration info (DOS)

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T

.tbl - graphics (native format) (PageMaker TableEditor)

.tbl - table of values (OS/2)

.tel - host file (Telnet)

.tga - TrueVision Targa bitmap graphics

.tmp - temporary file

.toc - Table Of Contents

.tre - directory tree file (PC-Tools)

.trm - terminal settings (Windows 3.x)

.tut - tutorial

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U

.ub - audio file (unsigned byte)

.uhs - Universal Hint System (binary file)

.uif - long prompts for windows (WordPerfect for Win)

.unx - text file containing UNIX specific info

.upd - program update info

.usr - user database file (Procomm Plus - Turbo C++ tour)

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V

.vbx - Visual Basic eXtension (Visual Basic)

.vga - VGA display driver

.vga - VGA display font

.vgd - VGA display driver (Generic CADD)

.vid - MS-DOS Shell Monitor file (MS-DOS 5)

.vid - bitmap graphics (YUV12C M-Motion Frame Buffer)

.vid - screen device driver (Word)

.voc - digitized samples (Creative Voice file)

.vst - Truevision Vista bitmap graphics

.vue - animation (3D Studio)

.vxd - Windows 3.x virtual device driver (QEMM)

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W

.w31 - startup file (Windows 3.1)

.wav - Waveform audio file (RIFF WAVE format)

.wbf - MS Windows Batch File (Catch)

.wbt - batch file (WinBatch)

.web - WEB source code file

.woa - swap file (Windows 3.x)

.wrs - Windows Resource eg. printer driver (WordPerfect for Win)

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X

.xbm - X11 Bitmap graphics

.xll - Excel Dynamic Link Library (MS Excel)

.xmi - compressed eXtended MIdi music

.xwd - X Window System window dump image graphics (SDSC Image Tool)

.xx - compressed file ASCII archive created by XXENCODE (uuexe515.exe)

.xxe - compressed file ASCII archive created by XXENCODE (uuexe515.exe)

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Z

.zip - compressed file archive created by PKZIP (pkz204g.exe)

.zoo - compressed file archive created by ZOO (zoo210.exe)

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