Created Issue: How to solve false “EF Power Tools: modelEntityContainerName contains characters that are not valid”? [898]

I'm facing an issue that many already faced, but with a difference: neither the SDF file name, or the path, contains invalid characters.
I've even tried with the Northwind.sdf file and Ikeep getting the same issue.

An example of a full path: D:\Sviluppo\dotnet\EnergiaClima\EnergiaClimaWindows\App_Data\Northwind.sdf

The error message:

```
System.ArgumentException: The modelEntityContainerName parameter 'D:\Sviluppo\dotnet\EnergiaClima\EnergiaClimaWindows\App_Data\NorthwindsdfContext' contains characters that are not valid.
at System.Data.Entity.Design.EntityModelSchemaGenerator..ctor(EntityContainer storeEntityContainer, String namespaceName, String modelEntityContainerName)
at Microsoft.DbContextPackage.Handlers.ReverseEngineerCodeFirstHandler.ReverseEngineerCodeFirst(Project project)
```

Any advice?