How to Fix Microsoft Project Decimal and List Separator Errors
Question details
The user needs to resolve an error preventing Microsoft Project from starting, caused by conflicting Windows regional settings.
- Product
- Microsoft Project
- Device & OS
- Windows
- Scenario
- Launching Microsoft Project to manage or view project files.
- Observed behavior
- Microsoft Project fails to start and displays a warning stating that the Windows decimal separator and list separator are set to the same value.
Ensure you have permission to modify system settings in the Windows Control Panel, and close any running Microsoft Office applications before making regional format changes.
Modify Windows Region Settings via Control Panel
Change the global Windows regional settings to assign distinct characters to the decimal symbol and the list separator.
Microsoft Project relies on the Windows operating system's regional configuration to parse data correctly. When the decimal symbol and list separator share the same character (commonly a comma in European formats), the application cannot distinguish between numerical values and list items, triggering a startup error.
Press the Windows key, type 'Control Panel' into the search bar, and press Enter. Navigate to 'Clock and Region' and click on 'Region'.
In the Region dialog box that opens, ensure you are on the 'Formats' tab, then click the 'Additional settings...' button located near the bottom.
In the 'Numbers' tab, locate the 'Decimal symbol' and 'List separator' fields. Change their values so they are different. For example, set the Decimal symbol to a period (.) and the List separator to a comma (,).
Click 'Apply' and then 'OK' on both dialog windows to save your changes. Restart Microsoft Project to confirm that the software now launches without the separator error.
Manage Your Project Data Seamlessly with WPS Office
While WPS Office does not natively replace Microsoft Project's scheduling engine, it serves as a highly compatible, free, and lightweight alternative to Microsoft Office. You can easily manage project budgets, timelines, and documentation using WPS Spreadsheet and WPS Writer without worrying about complex regional setting conflicts.
- 1. Download WPS Office: Visit the official WPS Office website and download the free installation package for Windows.
- 2. Create a Project Tracker: Launch WPS Spreadsheet and use one of the many free built-in templates to start tracking your project tasks and budgets.
- 3. Save in Excel Format: Save your project tracking documents as .xlsx files to maintain perfect compatibility with colleagues using Microsoft Office.
Frequently Asked Questions
Why does Microsoft Project require different decimal and list separators?
Microsoft Project uses these specific separators to accurately distinguish between numerical data and list items in its formulas, custom fields, and scheduling logic. If both separators are identical, the software cannot parse the data correctly, leading to functional errors or startup failures.
Can I change the list separator only for Microsoft Project instead of the whole Windows system?
No, Microsoft Project inherits its data formatting rules directly from the global Windows regional settings. Any changes made in the Control Panel will apply to all applications on your computer that reference system formatting.
What are the standard separators used in the US English format?
In the standard US English region settings, the decimal symbol is defined as a period (.), and the list separator is defined as a comma (,). Using this combination is the most reliable way to avoid separator conflicts in Microsoft software.
