DLL files are so-called dynamic link library files, which are provided under Windows by the operating system or other programs.
They contain program parts, e.g. Functions or data that can be dynamically reloaded and used by programs. Many drivers also use these files.
Many DLL files are available system-wide and are used by numerous programs. This reduces memory usage as different programs can use the same file and functionality.
It is generally not recommended to delete or modify files with the extension dll, as this can endanger the function of programs or even Windows itself. Even duplicate DLL files should not be touched because different versions of the same file may exist. However, existing DLL files in the directory of a program can be deleted during an uninstall.
Information about the DLL file can be obtained via the context menu (right-click).
It can create and modify DLL files with development environments like Microsoft Visual Studio
Most often resolving problems with opening DLL files is very simple. Just install an appropriate program that supports such files. All of the listed programs support DLL files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of DLL files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate DLL files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the Visual Studio applications is not on the list, select "Browse" option in order to manually locate the directory where Visual Studio has been installed.
Sometimes problems with opening DLL files may not lie with the application itself, but can arise due to other causes, such as: