999 File

What are 999 files and how to open them

Are you having problems opening a 999 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 999 files.

What is a 999 file?

The .999 file extension is most commonly used by Sage business software applications. The 999 files contain backup files that have been created with a Sage program.

The .999 file extension is also used for multi-pass security files.

How to open 999 files

Important: Different programs may use files with the 999 file extension for different purposes, so unless you are sure which format your 999 file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested three different 999 openers which you will find listed below.

Last updated: July 31, 2023

Various apps that use files with this extension

These apps are known to open certain types of 999 files. Remember, different programs may use 999 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 999 file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.