FileInfo.com


.DLL File Extension


File Type 1 Dynamic Link Library  (Most common)
File Format File
Common? No
File Description Compiled set of procedures and/or drivers referenced by a software program; allows the application to access system functions and communicate with a printer or other peripheral devices.

Many DLL files are included with the Windows operating system, while others are often installed with Windows programs; modifying the contents of a DLL file may cause errors within the program that references the file; therefore, it is wise not to open or edit DLL files.
Program(s) that open dll files Mac: Referenced by some cross-platform applications
Windows: Typically should not be manually edited or opened; May be modified using Resource Hacker (ResHacker)

File Type 2 DLL Dynamic Web Page
File Format Standard File
Common? No
File Description Web page generated dynamically when accessed by a user; may incorporate server-side scripts, such as Perl or VB scripts that generate the HTML for the Web page.

Web pages with DLL file extensions are typically hosted on Microsoft IIS Web servers; the DLL extension must be mapped to the correct scripting engine on the server in order for the page to be processed correctly.
Program(s) that open dll files Mac / Windows: View in a Web browser

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/dll