Every computer using a Windows operating system, and most Mac computers that have cross platform applications, use DLL files. DLL stands for "Dynamic Link Library" as these files contain a set of procedures used for most Windows programs. The files may also contain device drivers that are special computer programs to help your system operate and control devices that you connect to your computer such as your printer, keyboard, digital camera, scanner or external hard disk drive.
DLL files are an important part of your system. They allow more than one program to share similar system functions. By sharing system functions, your computer can allot more memory and hard drive space for your applications. DLL files that contain drivers will be constantly updated so that you have the most current version to your computer system as Windows analyzes the driver certificate to ensure it is from a trusted source.
You should never delete, open or modify a DLL file. This can cause serious program errors as your applications may stop running properly since they can no longer share the files. Your computer will also lose its ability to communicate with external devices. You may have to reinstall the computer program, the software application related to the external device, or your Windows operating system.