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Basic information about FOS file

When there is a problem with opening files with the file extension FOS（*.FOS or *.fos）, you do not need a computer expert. In most cases, using the helpful suggestions of experts contained in our website as well as appropriate programs, you can solve the problem with the FOS file yourself.

There are 1 file types using the FOS file extension in our database. In the further part of this page, you will find detail information about all the FOS file with their brief description and a list of programs that support FOS file sorted by operating systems. The table below provides useful information about the FOS file extension. It answers questions such as:
  • What is the FOS file?
  • How to open a FOS file?
  • What programs do I need to open a FOS file?
  • What programs help to create and edit a FOS file?
  • How to convert FOS files to another file format?
  • How to convert another files to FOS file format?


1.Detail information about FOS file extension: Fallout 3 Saved Game

File type Fallout 3 Saved Game Category Game Files
Developer Bethesda Softworks File format Binary
Description FOS file is a Fallout 3 Saved Game developed by Bethesda Softworks. Saved game file created by Fallout 3, a post-nuclear war action role-playing game; contains game progress, including the player's location, character abilities, items, and mission states; can be auto-saved by the game or manually saved by the player.
Software programs that will open, edit or convert FOS files

Windows		 Bethesda Softworks Fallout 3



Can't open a FOS file?

When you click a file to open it, operating system examines the filename extension. If operating system recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When operating system does not recognize a filename extension, you receive the following message:

”Can't open this file: example.FOS”。

To open this file, you install one of the applications from the list of software programs that you found here, you should be able to open, edit or convert the file with the FOS extension without any issue.


Where I can download the application that support FOS file?

If you do not know where you can download the application from our list, click on the link (which is the name of the program), you will find more information there on the location where to download the required application. Most often they are the websites of software manufacturers.


How 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.


Can I change the extension of FOS files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read/open the file. The problem is, changing the file extension does not change the file format. Select a software program from our list and install it on your computer. If the file has not opened correctly, you have to look for a different software program from our list. Sometimes you have to repeat the operation several times.


What else may cause problems width open a FOS file?

The reasons for the lack of the ability to open a FOS file on your computer may be at least several. The easiest thing is to find a suitable application installed on your computer, which will open a FOS file. If there is still something wrong, you might want to check:

  • Whether the FOS file is damaged.
  • Whether the FOS file is incorrectly linked in the registry entries.
  • Whether the FOS file extension has been accidentally removed from the Windows registry.
  • Whether the installation of an application that supports the FOS file format is incompletely.
  • Whether the FOS file is infected.
  • Whether the drivers of the equipment used for opening a FOS file are up to date.
  • Whether your computer has enough hardware resources to open a FOS file.

If the FOS file still not working with your software after eliminating the above shortcomings? That means that the problem is more complex and requires the help of a specialist.