File Extension Library

.PAC File Extension

  • Developer by: Netscape
  • Category: Web Files
  • Format: Text

What are .PAC files and how to open them?

Can't open .PAC file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .PAC file.

What is a .PAC file extension?

.PAC file extension is created by Netscape. .PAC has been classified as Web Files. The format of .PAC file is Text.

.PAC is Proxy Auto-Config File

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.

List of all softwares that can open the Proxy Auto-Config File
Microsoft Internet Explorer
Mozilla Firefox
Apple Safari
Mozilla Firefox
Mozilla Firefox
File Type 2:

PAC Subtitles File

Developer by: Screen Subtitling Systems Category: Video Files

Proprietary subtitles format created by Screen Subtitling Systems; used for synchronizing closed captions with a video timeline; can be edited with subtitle editing software such as EZTitles and converted to more standard formats, including .SRT and .SUB.

List of all softwares that can open the PAC Subtitles File
Screen Subtitling Systems Wincaps Q4
Screen Subtitling Systems Poliscript Create
Subtitle Edit
File Type 3:

SBStudio II Song File

Developer by: SonicSpot Category: Audio Files Format: Binary

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

List of all softwares that can open the SBStudio II Song File
FMJ-Software Awave Studio
File Type 4:

STAD Graphic File

Developer by: STAD Category: Raster Image Files Format: Binary

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.

List of all softwares that can open the STAD Graphic File
Lemkesoft GraphicConverter

How to fix problems with .PAC files

  1. You need to update the application that you normally use to open .PAC files. Only the latest version of the software supports the current .PAC file format
  2. You need to check the .PAC file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)