Why do I get the error "Failed to import the Project. The format of the specified file may be invalid." in Vijeo Designer?

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Issue
When trying to import a .VDZ project into Vijeo Designer, a popup dialog appears with the following message: "Failed to import the Project. The format of the specified file may be invalid."

Product Line
Vijeo Designer

Environment
HMI Programming software in Windows

Resolution
This error is usually associated with a corrupted or invalid VDZ project. The file structure of the file was altered in such a way that it cannot be read. Unfortunately, there is no way to recover such a file and the only option is to obtain a backup copy from an archive or the original programmer of the project.