.PAC File Extension

Configuration file used by Web browsers to select an appropriate proxy server; contains a JavaScript function named FindProxyForURL that defines rules for choosing a proxy server based on a given URL; used for controlling and load-balancing Internet traffic, especially in corporate environments.

PAC files are enabled in Web browsers by entering the PAC file URL in the proxy connection settings, or by using the Web Proxy Auto-Discovery (WPAD) protocol. When executed, a PAC file returns a string with one or more proxy server URLs.

PAC files typically are hosted on a Web server and are named proxy.pac.

NOTE: Since PAC files contain JavaScript code, they may be edited with a text editor.

Song format, called a PAC or package file, used by SBStudio; made up of data blocks that store song information and audio data.

Image format used by the STAD program for Atari ST systems; saved as a black and white image with a resolution of 640x400 pixels; considered a high-resolution graphic for Atari computers.