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.pack File Extension

Developer: Oracle
File type: Pack200 Packed Jar File
You're here because you have a file that has a file extension ending in .pack. Files with the file extension .pack can only be launched by certain applications. It's possible that .pack files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .pack file?

PACK files are categorized as Encoded Files developed by Oracle. They are called Pack200 Packed Jar Files because they refer to files created using the Pack200 utility; a tool that belongs to the Java 1.5.0 and a tool used to compress .JAR files. PACK files are also known to contain JAR files with up to sixty percent compression rate and these files are used by Java Web Start clients for the retrieval and unpacking of JAR files for Java programs. Aside from being compressed into .PACK.GZ files often, PACK files are also associated with ".jar.pack" extension compound. The main application used to open PACK files is the Oracle Java Web Start application which runs on MAC OS, Windows and Linux machines. This application allows users to launch full-featured applications easily and quickly. Whether the applications users are launching are chat clients, spreadsheet programs, etc. through this software, they can successfully launch these applications without hassle.

how to open a .pack file?

Launch a .pack file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .pack file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .pack files aren't yet associated with it. In this case, when you try to open a .pack file, you can tell Windows which application is the correct one for that file. From then on, opening a  .pack file will open the correct application. Click here to fix .pack file association errors

applications that open a .pack file

Oracle Pax200

Oracle Pax200

The Oracle PAX200 software is also referred to as PACK200 and this was developed by Oracle Corporation. This software is known as an HTTP compression method that is responsible for the transferring of JAR files over a network faster and easier and it is mainly included in the Java 1.5.0. PACK200 functions as JAR file compressors and it deals mainly with Java class files. This reduces the JAR file size up to 60% but since this is not a lossless compression, the JAR files produced through packing and unpacking will come out the same as the original file even if the class file structures are rearranged. The reduction of JAR file sizes is done through the removal of redundant class attributes, merging and sorting of some constant-pool data within the class files, the storage of internal data structures, the use of variable length and delta encoding as well as by picking types of optimum coding. This software features a JAR processor tool that is useful for building, repacking, signing and packing JAR files for a certain site.

a word of warning

Be careful not to rename the extension on .pack files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .pack. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.
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