EASMX File – What is .easmx file and how to open it?


EASMX File Extension

eDrawings Assembly XPS File – file format by Dassault Systemes

EASMX (eDrawings Assembly XPS File) is a file extension developed by Dassault Systemes. It is used for eDrawings Assembly XPS files, which are compressed XPS (XML Paper Specification) files that contain 3D assembly data. These files can be used to view and share 3D assemblies without the need for the original CAD software.


An EASMX file is a compressed XPS file that contains a representation of a 3D assembly created using Dassault Systèmes’ eDrawings application. It encapsulates the assembly’s geometry, appearance, and other relevant data, providing a lightweight and portable version of the original assembly. EASMX files are commonly used for sharing design and manufacturing information among collaborators or for viewing and annotating assemblies without the need for the full eDrawings software.

Usage and Applications

EASMX files facilitate collaboration and communication in engineering and design workflows. They enable users to share assembly information in a standardized format that can be easily accessed and reviewed by recipients, even those who do not have eDrawings installed. The compressed nature of EASMX files allows for efficient transfer and storage, making them suitable for cloud-based sharing and email attachments. Additionally, EASMX files support annotations, allowing reviewers to add comments, markups, and other feedback directly onto the assembly representation, facilitating design discussions and decision-making.

Opening EASMX Files Using eDrawings Viewer:

eDrawings Viewer, a free software application provided by Dassault Systemes, is the primary tool used to open and view EASMX files. This viewer enables you to examine the assembly structure, navigate through the components, and measure dimensions within the design. To open an EASMX file using eDrawings Viewer, simply download and install the software on your computer, then double-click on the EASMX file to launch it in the viewer.

Alternative Software for Opening EASMX Files:

In addition to eDrawings Viewer, there are several other software programs that can open EASMX files. These include:

  • CATIA: A comprehensive 3D CAD software suite that can import and export EASMX files.
  • SolidWorks: A popular CAD software used for mechanical design and engineering.
  • Autodesk Inventor: A feature-rich CAD and PLM software that can read and convert EASMX files.

It’s important to note that these alternative software options may have varying levels of compatibility with EASMX files, and may not offer the same features as eDrawings Viewer. However, they provide additional options for users who do not have access to eDrawings Viewer or prefer using different CAD software.

File Format and Application:

.EASMX files, denoting eDrawings Assembly XPS File, are developed by Dassault Systemes for storing assemblies created in SolidWorks CAD software. These XPS (XML Paper Specification) files contain 3D models of assemblies, along with metadata and annotations. They enable the sharing and viewing of complex CAD models in a lightweight and platform-independent format. eDrawings Viewer, a free software from Dassault Systemes, is used to open and interact with .EASMX files.

Advantages and Limitations:


  • Lightweight: .EASMX files are significantly smaller than their original SolidWorks assembly files, making them easier to share and download.
  • Platform-independent: XPS files can be viewed on any platform with an XPS viewer installed, making collaboration easier.
  • Measurement and annotation: eDrawings Viewer allows users to measure and annotate models, enhancing communication and collaboration.


  • Limited functionality: Compared to SolidWorks, eDrawings Viewer offers limited editing capabilities.
  • Loss of precision: Converting SolidWorks assemblies to .EASMX files can result in some loss of precision due to file compression.
  • Viewing only: .EASMX files are view-only, meaning they cannot be edited or modified directly in eDrawings Viewer.

Other Extensions