Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.MPX
File Type
Microsoft Project Exchange File
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .mpx file format
The MPX file format is a legacy ASCII-based file format developed by Microsoft for the purpose of exchanging project management data between Microsoft Project and other project management software applications. Introduced in the early 1990s, it was designed to be a platform-independent way to share…
File extension
.MPX
File type
Microsoft Project Exchange File
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .mpx file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .mpx.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .mpx file?
File extension details and usage information
The MPX file format is a legacy ASCII-based file format developed by Microsoft for the purpose of exchanging project management data between Microsoft Project and other project management software applications. Introduced in the early 1990s, it was designed to be a platform-independent way to share project schedules, task lists, resource assignments, and calendar information. Because it is a text-based format, it can be opened and edited in a standard text editor, although the structure is complex and follows specific syntax rules defined by Microsoft. While it was the industry standard for data interchange for many years, it has largely been superseded by the XML-based MPP and MPD formats in modern versions of Microsoft Project. Despite its age, it remains in use for legacy systems and specific integrations where newer binary or XML formats are not supported or required by older project management tools.
Software Compatibility
Programs that may open or work with .mpx files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .mpx files be converted?
Options for saving or exporting this file to another format
In many cases, a .mpx file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .mpx file.
Why can't I open a .mpx file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .mpx format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .mpx files
To open a .mpx file, use software that supports this file format.
- Microsoft Project
- RationalPlan
- OpenProj
- GanttProject
- Merlin Project
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .mpx file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.