I am trying to open this file testFile.docx

using the code

 static void Main(string[] args)
 {
     try
     {
         using (WordprocessingDocument doc = WordprocessingDocument.Open("testFile.docx", false))
         {
             Console.WriteLine("File is opened!");
         }
     }
     catch (Exception ex)
     {
         Console.WriteLine("General Exception caught:");
         Console.WriteLine($"Type: {ex.GetType()}");
         Console.WriteLine($"Message: {ex.Message}");
         Console.WriteLine($"StackTrace: {ex.StackTrace}");
     }
 }

But I am getting this message which isn't helpful

General Exception caught:
Type: System.InvalidOperationException
Message: Specified part does not exist in the package.
StackTrace: at System.IO.Packaging.Package.GetPart(Uri partUri)
at DocumentFormat.OpenXml.Features.PackageFeatureBase.DocumentFormat.OpenXml.Packaging.IPackage.GetPart(Uri uriTarget)
at DocumentFormat.OpenXml.Packaging.PackageUriHandlingExtensions.MalformedUriHandlingPackage.GetPart(Uri uriTarget)
at DocumentFormat.OpenXml.Packaging.OpenXmlPart.Load(OpenXmlPackage openXmlPackage, OpenXmlPart parent, Uri uriTarget, String id)
at DocumentFormat.OpenXml.Packaging.PartRelationshipsFeature.LoadReferencedPartsAndRelationships()
at DocumentFormat.OpenXml.Packaging.PartRelationshipsFeature.DocumentFormat.OpenXml.Features.IReferenceRelationshipsFeature.get_Relationships()
at DocumentFormat.OpenXml.Packaging.OpenXmlPartContainer.get_ExternalRelationships()
at Demo.Program.Main(String[] args) in ...

Is there a way to find which part is missing?