In some cases you could get the following error when opening the Visual Studio project file:
Unsupported
This version of Visual Studio is unable to open the following projects. The project types may not be installed or this version of Visual Studio may not support them.
For more information on enabling these project types or otherwise migrating your assets, please see the details in the "Migration Report" displayed after clicking OK.
The solution is to install (or re-install) D365FO VSIX Visual Studio add-in and make sure it is Enabled. You could get the latest version of the add-in by downloading service update deployment package from LCS and extracting it to a local folder. Then search for "Microsoft.Dynamics.Framework.Tools.Installer" under "DevToolsService\Scripts" folder.