Description

Need to find out which version of Visual Basic was used to create the project so it can be modified.

Solution

Visual Basic Solution keeps its version number in the solution file.

Find VisualStudio Version in .slu file
Find Visual Basic Version in .sln file

Microsoft names it Visual Basic versions as below:

Visual Basic .NET (2002) (VB 7.0)
Visual Basic .NET 2003 (VB 7.1)
Visual Basic 2005 (VB 8.0)
Visual Basic 2008 (VB 9.0)
Visual Basic 2010 (VB 10.0)
Visual Basic 2012 (VB 11.0)