If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .os3

1 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .os3 file?
  • Which program can create the .os3 file?
  • Where can you find a description of the .os3 format?
  • What can convert .os3 files to a different format?
  • Which MIME-type is associated with the .os3 extension?
OS/2 Warp 3 System Data .os3 file icon

OS/2 Warp 3 System Data

The OS3 file is an OS/2 Warp 3 System Data. OS/2 is a series of computer operating systems, initially created by Microsoft and IBM, then later developed by IBM exclusively.
Category: Data files
Application: IBM OS/2 Warp
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
.inf OS/2 IPF Hypertext Help System Data
.lgo OS/2 Warp Boot Logo
.bio OS/2 Warp Bios Data
.acv OS/2 Warp Audio Driver
.rsu OS/2 Warp Remote Software Update

Other types of files may also use the .os3 file extension. If you have helpful information about .os3 extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

.os Altair FEKO POSTFEKO Currents Data
.ls3 Magic Bullet Looks Package
.o3 Ozone Messenger Program Support File
.is3 SmartWare Input-Screen File
.osr Osu! Replay File
.ps3 PostScript

The .os3 filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

oe3 (1), o3 (1), ks3 (1), so3 (1), osw (1), os (1), oc3 (1), ls3 (1), is3 (1), ps3 (1), osr (1)

Can't open a .os3 file?

If you want to open a .os3 file on your computer, you just need to have the appropriate program installed. If the .os3 association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.os3

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android