Microsoft DLL Information

File Examples
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Applications access routines in DLL so the PC can run faster.
Many DLL routines have a .dll extension, but there are also other types of files in the library. A printer device driver is a DLL routine with a .drv file extension. The calendar that pops up when applications require a date is also part of the library and has an .ocx (ActiveX control) extension.
Advantages
Having a collection of commonly used routines used by many applications makes efficient use of system resources. Your PC has more memory available for you to use, and it runs faster. Software engineers like the DLL concept because they don't have to rewrite code for common routines. Overall, DLL allows for a modular architecture that makes it easier to upgrade the system and add applications.
Disadvantages
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Sometimes, when an application tries to find a routine in DLL, it is not there.
Because they rely upon routines in the library, applications are not self-contained. If a needed routine is missing or corrupted, the application will not work. Users, especially in earlier releases of Windows operating systems, encountered DLL error messages when trying to install and upgrade applications because of missing DLL files.
Fixes
Starting with the Windows 2000 and XP operating systems, Microsoft added Windows File Protection software to keep files used by Windows Setup intact. Search for Windows File Protection in your PC's Help and Support Center for more information.