Opening an OSI File

The OSI file type is primarily associated with Overlord II.

OSI	File extension: OSI
	File type:	saved game file

What is an OSI file

OSI files mostly belong to Overlord II. OSI files are used by Overlord II to store your game progress.
This file holds the game state including settings, levels finished, characters, and inventory.
Because the file is in a binary format, it is designed to be read only by the game engine.
Key details summarized by FilExt.com:

It is a saved game file specific to Overlord II.

The data is structured to restore your gameplay exactly as you left it.

It is not meant for manual editing with text editors.

Modding tools may help interpret its data, but care is required.

FilExt.com note: If you need more technical details, community forums for Overlord II can be a useful resource.

How do you open OSI files?

You need a suitable software like Overlord II to open an OSI file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your OSI file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a OSI file directly in the browser:. Just drag the file onto this browser window and drop it.

Online OSI Text Viewer

Choose your .osi file to analyze

or drag and drop it here

Online File Viewer

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Programs that open and convert OSI files:

Overlord II
See the previous paragraphs to learn more about the main application. OSI files are often referred to as Overlord II games because this type of file is primarily created or used by this software.
Osiris (Database) by The Shmoo Group
Osiris is a file integrity verification system that can be used to monitor changes to a file system over time. Osiris consists of a pair of applications, osiris and scale. The first application, osiris, is used to collect specific data from the local filesystem and store that data into a database. The second application, scale, is then used to analyze, and/or compare the differences between two databases.
SunNet OSI (Description File) by Sun
Sun has used .OSI files to document portions of their SunNet system. These are simply text files with the .OSI extension. Open them in any suitable text editor. This file format is classified as Text.

OSI file format details:

If you know the file format, you can also find out how to open or edit the file. The file format can be deduced from the file extension and the signature. If the file extension does not match the file format, double-clicking on the file will cause an error upon opening. So a detailed analysis of a file is vital in order to determine the format and the associated program. Below you will find our evaluation of the OSI files:

The OSI file extension is not common and includes different formats for different programs. The following file formats are most commonly found in OSI files:

30% of all OSI files use the same file format, which have the signature 00 00 00 01 4F 53 49 00. If you open these files in a text editor, you will see only illegible characters. The files are 130 bytes to 250 bytes in size, with a median of 130 bytes. Several words can almost always be found in the files, e.g. SYSTEM_RPK@GENERIC_STRINGS@TOWER and Tower. Examples of file names are SaveInfo.osi.
9% of all OSI files start with the magic bytes 00 4F 73 69 72 69 73 20 73 61 76 65 20 66 69 6C, which are always the first bytes of this file format. These files contain neither text nor words, but only data. The files are often between 1 MB and 11 MB in size. The files contain the following words: Osiris save, Osiris save file dd and Version 1.8. A common filename is story.div.osi.

The remaining 61% of all OSI files are different files with different signatures, often e.g. ZIP and Bolt. The category is movingobject, pcprog, pump or take. If you want to find out which format your OSI file belongs to, just click on the button "Choose your .osi file to analyze".

Technical Data for OSI File Extension

File classification:

Game

Related files:

save, gsv, osg, iso, exe, bin, pdf, psafe3, tdb, ssd, sav, dat

an osi saved game file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with OSI files

Associate the OSI file extension with the correct application.
Update your software that should actually open saved game files. Because only the current version supports the latest OSI file format. Search, therefore, e.g. on the manufacturer website after an available Overlord II update.
To make sure that your OSI file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .OSI file online - secure, fast, and no downloads needed.