File extension .PAC
| Full Name | Developer | Category |
|---|---|---|
| Atari STAD Image Format | Netscape | Web Files |
A .PAC file is a Proxy Auto-Config File, also referred to as a PAC file, is a text-based file written in JavaScript language which secretly defines how web browsers and other user agents can anonymously connect to the Internet. It tells a browser or other application how to automatically select a proxy server for different sorts of web traffic, based upon the configured pattern-matching rules when connected to a particular network.
How Does It Work?
Configured by system administrators, a .PAC file may define intermediary or “proxy” servers to route all requests through for access to certain Internet resources. When an application requests a web URL, the PAC file reviews the DOMAIN/URL and finds the best proxy server for that request.The web request is then sent to the proxy server set in the .PAC file which goes ahead and requests data from the original server on behalf of the client. This way of anonymous navigation is done by searching through the proxy servers for an available connection port and then proxying the client so they remain anonymous.
Different Types Of Proxy File Extensions
Apart from .PAC, there are different types of proxy files extensions available such as .DAT, .CFG, .PRF, and many more. The popular software like WinGate, Zalanyx Proxy Server, Charles Web Debugging Proxy, etc. utilize these files for accessing online services and websites.
Programs for WINDOWS system
Programs for MAC system
Programs for LINUX system
After installing the required software, the operating system will usually automatically associate an unknown file type (in this case .PAC) with the new application. If this does not happen, we can help the system a bit by selecting the software for it, which it should always use to open files with the .PAC extension.
When choosing the software we can select the system to use this software every time.
Remember!
Using it for the first time it is good to check whether the .PAC file opened in the application can be read by us and opens in a way that allows us to use it. If everything is in order, select this option the next time you open a file with the .PAC extension. However, if the file has not opened correctly, we have to look for a different software, with which we can open files with the .PAC extension. Select a different software from our list and install it on your computer. After the software is installed, repeat inspection openings of a .PAC file. Sometimes you have to repeat the operation several times.
Other instructions
If none of the programs listed by us to work with the .PAC file has not meet your expectations, you can try searching other websites. But remember to avoid downloading programs "that can open any file". These applications not only have very limited functionality, but may also expose you to expense tens of dollars when purchasing a license.
In the vast majority of cases you will find the program dedicated to support the .PAC file, or any other file format. In addition, there is a chance that it will be a free program, and its functionality (concerning the .PAC file) will be extended to the maximum.
It is also good to check
- if the .PAC file has no errors
- or if it has been copied (or downloaded by the browser) thoroughly
Author’s guidelines
Mr B. Adam
Author of the guidelines / Founder of FileExtension.info
New technologies enthusiast, helping to solve problems with the files.
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