What Is an AOF File?

How to open, edit, & convert AOF files

Screenshot of several AOF files in Windows 10 that open with Artlantis Studio


A file with the AOF file extension is an Artlantis Object file. These files are 3D images that the Artlantis Studio and Artlantis Render software use as part of an Artlantis 3D Scene (.ATL file).

Newer versions of the Artlantis software have replaced the Artlantis Object file format with files that have the .ATLO file extension.

If your AOF file isn't used with Artlantis software, it may instead be an Acorn Object Format file. These files are combined with object libraries on the now discontinued Panos operating system (developed by Acorn Computers) to produce an executable program image file (.RIF).

Your AOF file may be an append-only file if it's not in either of the above formats.

How to Open an AOF File

AOF files that are Artlantis Object files can be opened with Artlantis Studio or Artlantis Render. Here's how to open the file with Artlantis Studio:

  1. Open the menu button at the very top-left corner of the program. It looks like a diamond.
  2. Go to Open... > Artlantis Object Document.
  3. From the drop-down menu at the bottom corner of the Open screen, change the Artlantis Objects (*.alto) option to be Old Artlantis Objects (*.aof).
  4. Find the AOF file you need to open, and hit the Open button.

Demo versions are available for both Artlantis programs through that link on the download page. Both can be used on Windows and macOS.

While your AOF file is most likely in that format, it's possible that it's instead an Acorn Object Format file. These files can be opened using Acorn 32000 Linker, but I can't find a download link There may not be one available anywhere since the Panos OS isn't widely used.

Append-only files using the AOF file extension are associated with Redis, so you might be able to open one with that program.

If your AOF file is most definitely not used with Artlantis software, but you aren't sure how to open it, try using a free text editor to open it. When you view the file as a text document, you may be able to pull out some information within the AOF file that explains the format it's saved in.

If you find that an application on your PC does try to open the AOF file but it's the wrong application or if you would rather have another installed program open AOF files, see our article on how to change the default program for a specific file extension guide for making that change in Windows.

How to Convert an AOF File

Artlantis' Studio Media program is used to convert AOF to ATLO. If you download Artlantis Studio, which comes in a ZIP file, there are two EXE files that you can choose from. One is Artlantis Studio and the other is Artlantis Studio Media.

Artlantis has some plugins available for programs like SketchUp and Revit that let you export models to the ATL format. Those files, when opened in Artlantis Studio, can then be exported to the new Artlantis Object file format (.ATLO).

Again, I don't have a download link for Acorn 32000 Linker, but if you do happen to have that program running on the Panos operating system, I know that you can use it to open the AOF file.

Still Can't Open the File?

The most likely reason for why an AOF file won't open even after trying the programs above is because the file extension is being misread. If you confuse another file format with the ones mentioned on this page, you might think that your file ends with AOF when really it just looks that way.

For example, the AAF file extension shares two out of three of the file extension letters seen with AOF files even though the formats have nothing to do with each other. Opening an AAF file in an AOF opener will do you no good, and neither will using an AAF file opener with an AOF file.

The same idea is true behind others like the AFF file extension. While it certainly looks like an AOF file in letters alone, AFF files actually belong to the Spellcheck Dictionary Description and AFF Disk Image formats. Some more examples include AFIAIFF, AOB, and ALO files.

If your file doesn't end with the .AOF suffix, research the extension it is using to learn more about the format it might be in. This will help you find the software responsible for opening it, editing it, or converting it.