File Cannot Open

How to Fix Microsoft Project File Cannot Be Opened Errors

Phi Hung Vo Oct 22, 2026 869 views

Question details

The user is unable to open a Microsoft Project file due to data corruption or OneDrive synchronization issues.

Fix Microsoft Project File Cannot Be Opened Errors

Product: Microsoft Project
Device & OS: not provided
Scenario: Attempting to open a synchronized project file directly from OneDrive or opening previous versions of the project.
Observed behavior: Microsoft Project displays an error stating that the file cannot be opened because it is damaged.

Before you start

Before proceeding, check your OneDrive sync status to ensure no uploads are currently paused or stuck, and try to locate an older, working version of the file in your version history.

Solution 1Recommended

Save the Project Locally and Convert to XML

Bypass OneDrive sync conflicts and strip out file corruption by saving the file to your local drive and converting it to an XML format.

OneDrive synchronization can sometimes interfere with the complex structure of Microsoft Project files, leading to corruption. Converting the file to XML effectively rebuilds the project data, removing corrupted elements so the file can be opened normally.

Open a working version

If the current file refuses to open entirely, access the file's version history in OneDrive and open a recent previous version that still works.

Save to a local hard drive

Navigate to 'File' > 'Save As'. Instead of saving to your OneDrive folder, choose a local directory on your computer (such as your Desktop or local Documents folder).

Export as an XML file

Go to 'File' > 'Save As' again. From the 'Save as type' dropdown menu, select 'XML Format (*.xml)' and click Save.

Reopen the XML file

Close Microsoft Project completely. Reopen the application, navigate to 'File' > 'Open', and select the newly created XML file to load your recovered project data.

Save the Project Locally and Convert to XML

Potential Formatting Loss: While the XML conversion is highly effective at recovering structural project data and resolving corruption, it may result in the loss of some custom formatting and views.

Free Microsoft Office alternative

Looking for a Reliable Alternative for Your Office Tasks?

While Microsoft Project is used for specialized project management, you can easily manage daily project reports, timelines, and budgets using WPS Office's powerful spreadsheets. It is a lightweight, free alternative that perfectly handles standard Office formats without heavy cloud sync issues.

1. Download the software: Visit the official WPS Office website and download the free installation package for your operating system.
2. Install and launch: Run the installer and follow the on-screen prompts to set up your new office suite.
3. Manage projects easily: Open WPS Spreadsheet to utilize built-in project management templates or open your existing .xlsx project trackers.

Create project timelines, Gantt charts, and track budgets using robust spreadsheet tools.Highly compatible with Microsoft Excel (.xlsx), Word (.docx), and PowerPoint (.pptx) formats.Free and lightweight, avoiding heavy cloud sync complications that often lead to file corruption.Familiar, tabbed user interface for seamless workflow migration.

Frequently Asked Questions

Why do Microsoft Project files get corrupted on OneDrive?

Sync interruptions, momentary network drops, or concurrent background syncs can damage the complex internal data structure of .mpp files, triggering errors when you try to open them.

Can I recover custom formatting lost during the XML conversion?

Unfortunately, any custom formatting stripped during the XML saving process cannot be automatically recovered. You will need to manually reapply your custom styles, text colors, and specific views after reopening the XML file.

How can I prevent Project files from corrupting in the future?

To minimize the risk of corruption, save your active Project files to a local drive while you are actively working on them. Only copy or upload the file to OneDrive as a backup after you have completely closed Microsoft Project.

Document & File Issues