About DLL files (from Filext.com)
Quote:
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A .DLL file is a support file and is used by one or more programs. As an example, if several parts of a program need to perform the same action that action may be placed into a .DLL file (library) that the various program parts can all use. This saves space and makes it easier when that particular routine needs to be updated. You should never have a need to "open" a .DLL file on its own; indeed, there really is no way to do so. Note: This file type can become infected and should be carefully scanned if someone sends you a file with this extension. If you want to look at the resources in a DLL library you can use a program like PE Resource Explorer but BE CAREFUL as messing with a DLL file can seriously damage Windows or programs if you do the wrong thing.[/b]
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Also, DLL files are often associated with directx.
(I have to go now but I'll be back)