File Extension Database

Open 1 File

The .1 file extension is widely used by a variety of computer applications. For example it is used by the File Splitter software ( to assign a number to a chunk of a very large file. This happens when a large archive is created and the user wants to divide the archive into smaller volumes. The .1 file extension is assigned to the first file in the split file.

On the other hand, the Unix operating system also uses the .1 file extension when the system creates a raw manual page. Level 1 user manuals describe general commands for the Unix operating system. Each level 1 user manual is stored in a file with the same name as the command it describes followed by the extension .1. For example, a manual describing the open_window command would have the file name open_window.1.

In some cases Mozilla Firefox will also use the .1 extension, giving it to files that store data about cookies, images, and pop-up permissions. The AIM Messenger messaging service also uses the .1 extension for certain instant messaging files.

Some compressed files on Unix-based Operating Systems that are normally compressed into .GZ files, may have the compound extension .gz.1. In this case, the numbering may well continue using the extensions .2 to .8 for other sections. For example, the extension .2 is used for System Call documentation.

It should be noted that the extension .1 is not the same as .one and its associated functions are totally different.

Below you will find a list of the programs that are capable of opening / creating files with the extension .1

  • Microsoft Windows:
    • Sublime Text
    • Atom
  • Apple macOS / Mac OS X:
    • Sublime Text for Mac
    • Atom for Mac
  • Linux / Unix:
    • The operating system is already able to work with these types of files.
    • GNU Emacs
  • Other suggested software:
    • Sublime Text for Linux
    • Atom for Linux

Open 1 File on Windows

Open 1 File on Mac OS

Open 1 File on Android

If you downloaded a 1 file on Android device you can open it by following steps below:

Open 1 File on iPhone or iPad

To open 1 File on iOS device follow steps below:

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