Hello and welcome to our forums,
A .vdproj file is a Software development project created by Visual Studio, an application that allows developers to create Windows programs; it stores project build settings and file references; it is often used for building and packaging Windows programs. Setup and deployment projects are commonly built into .MSI or .EXE files, which can are used for software installation in Windows. VDPROJ files are saved in a text format and can be viewed with a text editor if needed.
This feature was removed in Visual Studio 2012, but fortunately, it is still available as an add-in. In order to download this add-in, you can have a look on the
"Microsoft Visual Studio Installer Projects" article. As you can see under the "NOTE" section,
this extension is designed to work with Visual Studio 2017 and Visual Studio 2019.
Also, for more information about the .vdproj removal, you can have a look on the
"Project migration and upgrade reference for Visual Studio 2017" article -> see "InstallShield MSI setup" section.
Hope this helps.
Kind regards,
Catalin