Hidden Project Files in Solution Explorer
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There are several Microsoft Visual Studio 2005 Tools for the Microsoft Office System project files that are hidden in Solution Explorer by default. These files appear when you click Show All Files. The extensions for the files are .designer.xml, and .designer.vb or .designer.cs. These files are generated by Visual Studio Tools for Office, based on the document structure.
Do not modify these files. Modifications to hidden files are not supported.
The generated files are completely regenerated whenever certain changes occur in the document. If you make any changes to these files manually, those changes will be lost the next time the file is regenerated. For that reason, they are included mainly for reference purposes.