''This is an amalgamation of information regarding specific [[Microsoft Windows]] [[Dynamic-link library]] (DLL) files.'' A [[DLL]] file is an extention of a program or .exe file. Microsoft designed these files so that you could run a program that would normally take up a lot of memory, on a machine that does not have a lot of memory. This move made their [[operating system]] more versatile. However, these files should not be messed with because if they are, they may render your computer inoperable. Windows XP hides these files by default so that they are not accidently deleted.