1 File

What are 1 files and how to open them

Are you having problems opening a 1 file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 1 files.

What is a 1 file?

The .1 file extension is used by a variety of computer applications. It is commonly used by the File Splitter software to assign a number to a volume of a split file. This happens when a large archive file is created and the user wants to split the archive file down into smaller volumes. The .1 file extension is given to the first file of the split file archive.

The .1 file extension is also used by the Unix operating system when the system creates an unformatted manual page. In some cases Mozilla Firefox will also use the .1 extension, giving it to files that store data about cookie, image and pop-up permissions. AIM Messenger also uses the .1 extension for certain IM files.

How to open 1 files

Important: Different programs may use files with the 1 file extension for different purposes, so unless you are sure which format your 1 file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different 1 openers which you will find listed below.

Last updated: December 22, 2023

Various apps that use files with this extension

These apps are known to open certain types of 1 files. Remember, different programs may use 1 files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about 1 file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.