The Open dialog in Microsoft Project allows you to do complex searches for project files across your machine or your network. This search functionality allows you to not only search for certain file names or file types, but also to search across the other file properties, such as Author, Category, Subject, Title, or Keywords. This can be a powerful tool when files you need to access have been moved from their original location or are misplaced.
Perform a Basic Search
Click File, Open to bring up the Open dialog, click the Tools menu, and select Search.
Enter the text you want to search for in the Search Text field.
In the Search In field, specify where to look for your files.
In the Results Should Be field, specify the file types to search for.
Click the Go button to start your search.
The Results field shows you the files that match your search.
Select your file and click OK to go back to the Open dialog.
Perform an Advanced Search
Select the Advanced tab to perform an advanced search.
In the Property field, you can select the specific property of the documents you want to search for.
The Condition field lets you specify whether the field should look for the exact text you specify, or if it should only contain it.
In the Value field, enter the text you want to search for.
Click the Add button to add the search criteria to the list. You can add several criteria to narrow down your search.
Click File, Open to bring up the Open dialog, click the Tools menu, and select Search. 
Enter the text you want to search for in the Search Text field. 
In the Search In field, specify where to look for your files. 
In the Results Should Be field, specify the file types to search for. 
Click the Go button to start your search. 
The Results field shows you the files that match your search. 
Select your file and click OK to go back to the Open dialog. 
