photoviewer multiple files c#

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C#

DLL

I can open one file from c# as follows:

string exe = "C:\\Windows\\System32\\rundll32.exe"
string arguments = "\"C:\\Program Files (x86)\\Windows Photo Viewer\\PhotoViewer.dll\", ImageView_Fullscreen c:\\test.jpg";
Process.Start(exe, arguments);

but when I try opening multiple files as follows

string exe = "C:\\Windows\\System32\\rundll32.exe"
string arguments = "\"C:\\Program Files (x86)\\Windows Photo Viewer\\PhotoViewer.dll\", ImageView_Fullscreen c:\\test.jpg & c:\\test2.jpg";
Process.Start(exe, arguments);

It works for one file or on the command line but it doesn't work in c#. Anyone have any ideas?

[This is the re-post of the inquirer's previous questions: Open multiple files using photo viewer[^]. As I can see, my syntax fix is taken into account, but the problem is probably not solved. —SA]