Test failures: System.Diagnostics.Tests.ProcessStartInfoTests on windows.11.amd64.clientpre

[CarnaViire]

StartInfo_NotepadWithContent and StartInfo_NotepadWithContent_withArgumentList fail with the following

Assert.Equal() Failure
          ↓ (pos 0)
Expected: notepad
Actual:   Notepad
          ↑ (pos 0)

Date	Count	Branch
4	2021-10-08	PR #60173
4	2021-10-07	PR #59925
4	2021-10-01	PR #59475
4	2021-09-28	PR #59712
4	2021-09-21	PR #59204
4	2021-09-16	PR #51736
4	2021-09-14	PR #57634
4	2021-09-13	PR #58922
8	2021-09-10	PR #58922, PR #57324

[am11]

--- a/src/libraries/System.Diagnostics.Process/tests/ProcessStartInfoTests.cs
+++ b/src/libraries/System.Diagnostics.Process/tests/ProcessStartInfoTests.cs
@@ -1318,7 +1318,7 @@ private void VerifyNotepadMainWindowTitle(Process process, string filename)
             string expected = Path.GetFileNameWithoutExtension(filename);

             process.WaitForInputIdle(); // Give the file a chance to load
-            Assert.Equal("notepad", process.ProcessName);
+            Assert.Equal("notepad", process.ProcessName, ignoreCase: true);

             // Notepad calls CreateWindowEx with pWindowName of empty string, then calls SetWindowTextW
             // with "Untitled - Notepad" then finally if you're opening a file, calls SetWindowTextW

while this will fix the assertion failure. As to the reason for the difference, it could be:

• it is spelled as Notepad.exe under system32 on that particular machine or generally on that version of windows?

• the underlying Win32 API, NtQuerySystemInformation's documentation seem to provide no version-to-version compatibility guarantees:

  NtQuerySystemInformation may be altered or unavailable in future versions of Windows. Applications should use the alternate functions listed in this topic.

  Issue 55685 processname optimisation #59672 is changing ProcessName to use QueryFullProcessImageName which may (or may not) return the lower case on Windows 11. If someone with rights can run outerloop pipeline on that PR, we will find out.

• something else?