The PKG computer file extension is used by more than one program or application, so the content of the PKG file on your system depends on the computer, operating system and the programs that you've downloaded or installed. In general, the PKG extension denotes a package file that contains an archive of installation and executable files.
PlayStation Store PKG Files
If you've bought and downloaded an item from the Sony PlayStation store, the downloaded file will have a PKG file extension. The encrypted file won't open on your computer, but it will open on your Sony PlayStation 3 or PlayStation Portable games console. Transfer the PKG file to the games console via your home network or with a USB flash drive or external hard drive. Once transferred, open the PKG file on the PlayStation to install the downloaded game, movie or demo.
Apple Installer PKG Files
The Apple Mac OS X operating system uses files with the PKG extension to package and compress the files needed to install a specific program or application. The PKG file is similar to the MSI installer files used by computers running the Microsoft Windows operating system. If you've downloaded a program for your Apple Mac, the program's installation files may be contained in a PKG file. You can view the contents of the PKG file on your Mac by right-clicking the file and selecting "Show Package Contents" from the context menu. To install the program from a PKG file, double-click the file.
Symbian PKG Files
Smartphones using the Symbian operating system use SIS files to launch and run applications on the platform. In some cases, the application developer packages SIS files with instructions, information and command lines in a PKG file. You can open a PKG file and view the contents on a Windows computer with the UnSIS, Easy SIS Creator and CreateSIS utilities. Although you can view the contents of the file on the computer, you can only install the application contained in the file on a smartphone with the Symbian operating system.
CoCreate Modeling PKG Files
CoCreate Modeling software uses the PKG file extension to compress and package the files required for downloading a 3-D model. The PKG format reduces the size of the files and makes them easier to download in one session. You can view and open the files with CoCreate Modeling, or the earlier software versions known as SolidDesigner or OneSpace Designer. Adobe Acrobat Pro X software can also open this PKG format on both Windows and Mac computers.
Precautions
Computer viruses and malicious software can come with almost any file format extension. If you don't recognize a file and can't remember downloading it, always scan the file with your computer's anti-virus software before viewing the contents or opening and installing the file. Most anti-virus programs allow you to scan an individual file by right-clicking the file and selecting the virus scan option from the context menu. Otherwise, open the file in the anti-virus program to scan and check the contents.
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