Incorrect src attribute in nuspec file causing file not found exception

[yanlinlin]

Type (choose one):

• Bug

NPE version: (e.g. 5.x) (see Help -> about)
NuGet Package Explorer - Zip - X64 - (6.0.92+c06b7b6e25)

OS version: (Windows 7, 10 - 1803/17134, etc)
Windows11 22621.2715

Installed from: Microsoft Store / Chocolatey.org / Zip on GitHub / CI channel
Zip on GitHub and source code

Open a nuspec file saved by this tool failed. A message box says "Could not find a path" or "File not found" is shown. Here are the steps to reproduce:

1. Create a package
2. Add an existing file
3. Save the metadata to a nuspec file (must in a different folder from the existing file)
4. Open the nuspec file

The problem is the src attribute of file does not be set correctly. The src has the same value with target rather than the relative or absolutive path on disk. So it can not be found.

  <files>
    <file src="lib\net45\zh-CN\DeviceState.resources.dll" target="lib\net45\zh-CN\DeviceState.resources.dll" />
    <file src="lib\net45\AlarmLevel.cfg" target="lib\net45\AlarmLevel.cfg" />
    <file src="lib\net45\DeviceNameOverride.cfg" target="lib\net45\DeviceNameOverride.cfg" />
    <file src="lib\net45\DeviceState.dll" target="lib\net45\DeviceState.dll" />
    <file src="lib\net45\DeviceState.pdb" target="lib\net45\DeviceState.pdb" />
  </files>

I debug for a while and find the bug in PackageViewModel.ExportManifest method. The OriginalPath method wants to convert PackageFile to PackageFileBase to get the OriginalPath but failed because PackageFile does not derive from PackageFileBase and has its own OriginalPath property. So changing the OriginalPath method to

        public static string? OriginalPath(this IPackageFile? packageFile)
        {
            if (packageFile is PackageFileBase packageFileBase)
                return packageFileBase.OriginalPath;
            else if (packageFile is PhysicalPackageFile physicalPackageFile)
                return physicalPackageFile.SourcePath;
            else if (packageFile is IPackageContent packageContent)
                return packageContent.OriginalPath;
            return null;
        }

seems solving the issue. Could someone have a look?