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How to Reduce Microsoft Project File Size by Removing Enterprise Fields

John Wilson Oct 9, 2026 868 views

Question details

The user needs to significantly reduce the size of a Microsoft Project file that became bloated due to the inclusion of enterprise custom fields and global items.

How to Reduce Microsoft Project File Size by Removing Enterprise Fields

Product: Microsoft Project
Device & OS: not provided
Scenario: Attempting to optimize and manage a project schedule file that has grown excessively large after multiple saves.
Observed behavior: The .mpp file size unexpectedly increased from 1 MB to 16 MB, and standard saving methods do not reduce the file footprint.

Before you start

Open your current Microsoft Project schedule and take note of any custom views, Gantt chart color settings, and special formatting, as you may need to manually restore these elements using the Organizer tool after cleaning the file.

Solution 1Recommended

Save the Project File as XML to Clear Cached Data

Exporting your schedule as an XML file strips away redundant enterprise data and hidden cache, significantly reducing the overall file footprint.

This is the most reliable method for resolving extreme file bloat. Be aware that this process will likely remove custom views, formatting, page setups, tables, filters, groups, and reports, requiring you to restore them later.

Save as XML

Open your large project file in Microsoft Project. Go to File > Save As, choose your destination folder, and select 'XML Format (*.xml)' from the 'Save as type' dropdown list, then click Save.

Import the XML File

Close the current project file completely. Next, go to File > Open, locate the newly created XML file on your computer, and open it.

Create a New Project

Follow the on-screen Import Wizard instructions to import the XML data into a new project schedule. Once imported, save it as a standard .mpp file.

Save the Project File as XML to Clear Cached Data

Restoring Your Custom Elements: Keep your original bloated .mpp file as a reference. You can use the Organizer tool (File > Info > Organizer) to copy your custom formatting and Gantt chart views from the original backup into your newly optimized project file.

Solution 2

Manually Remove Enterprise Custom Fields

If you want to reduce file size without losing your formatting, manually stripping out enterprise fields is a highly targeted approach.

Free Microsoft Office alternative

Manage Project Timelines Easily with WPS Office

If dedicated project management files become too complex or large to manage, WPS Office offers a free, lightweight alternative. You can use WPS Spreadsheet to create robust Gantt charts and track project tasks without dealing with excessive file bloat or lost formatting.

1. Download WPS Office: Visit the official WPS website and download the free software suite for your operating system.
2. Open WPS Spreadsheet: Launch the application and select WPS Spreadsheet to start a new blank workbook.
3. Apply a Project Template: Click on 'Templates' from the home screen, search for 'Project Management' or 'Gantt Chart', and apply a template to easily start tracking your schedule.

100% free and lightweight alternative to heavy project management software.Fully compatible with Microsoft Excel formats (.xlsx, .xls) for seamless project tracking.Access built-in, customizable Gantt chart and schedule templates directly from the library.Familiar user interface ensures a completely seamless transition with no learning curve.

microsoft office alternative - wps office

Frequently Asked Questions

Why does my MS Project file size increase so drastically after a few saves?

File bloat in Microsoft Project typically happens when enterprise custom fields, global items, and cached background data accumulate within the .mpp file over multiple save cycles.

What happens to my formatting when I save a project as an XML file?

Converting an .mpp file to XML typically strips out custom views, formatting, page setups, tables, filters, groups, and reports in order to produce a cleaner, smaller file.

How do I restore custom views that were removed during the XML conversion?

You can restore lost formatting by opening your original backup file and your new optimized file simultaneously. Then, navigate to File > Info > Organizer to selectively copy the specific views and formatting over to the new file.

What is the Organizer tool in Microsoft Project?

The Organizer is a built-in feature that allows users to copy specific project elements like custom views, tables, filters, and reports between different project schedules or the main Global.mpt template.

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