Hi @Gabriel Fernandes ,
Welcome to Microsoft Q&A!
Visual Studio is backwards compatible. Each version of Visual Studio prior to Visual Studio 2010 is tied to a specific .NET Framework. For Visual Studio 2010, it targets .NET Framework 4 or older.
If your VS2019 project uses the new features of VS2019 or the .NET features available only in .NET 4.5 or newer, I suppose you can’t open it in VS2010. The project may be incompatible with the Visual Studio 2010.
Besides, I suggest you make a backup of the project and try to open it with VS2010. If your project meets the requirement in VS2010, there is a reasonable chance that you can open it without problems.
Sincerely,
Anna
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