SOFTIMAGE XSI add-on file
File type: Plugin, addon file
A .xsiaddon file is an add-on package for SOFTIMAGE XSI 3D animation software.
The file contains components that extend the software's functionality and is used with the Windows version of SOFTIMAGE XSI.
File type category:
Plugin, addon file
Date updated: November 4, 2026
The xsiaddon file extension is associated with SOFTIMAGE XSI, advanced 3D animation software used in games, film and television. The software was developed by Avid Technology, Inc., and was later sold to Autodesk.
An .xsiaddon file packages an add-on for SOFTIMAGE XSI. Add-ons can provide additional tools or other software components for use within the application; the file is not a standard scene or media file.
SOFTIMAGE XSI and its later Autodesk Softimage releases were available for Microsoft Windows. The format is now mainly encountered in legacy projects and installations.
Install or load the .xsiaddon file from within a compatible installation of SOFTIMAGE XSI or Autodesk Softimage. Use Autodesk Softimage 2015 to open files with this extension.
The file is an add-on package rather than a document intended for standalone viewing, so it cannot normally be opened with a general-purpose file viewer.
An .xsiaddon file cannot be meaningfully converted to a standard media or scene format. It is a package of software components rather than an editable data document.
To use its contents in another environment, the add-on must be loaded in a compatible SOFTIMAGE XSI installation; any assets or data it provides must then be exported using the application's available export options.
Software applications that handle other tasks involving xsiaddon files:
Microsoft Windows
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