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Can't confirm existence of file on Windows 8 network drive

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Hi folks. I'm having an issue with Windows 8. I basically want to test the existence of a file located on a network drive. Here are my tests:

Using VB2008, my test project only contains one line of code: MsgBox(My.Computer.FileSystem.FileExists("Z:\MyDB.mdb")).  I compiled the test project once using a manifest which includes "RequireAdministrator" and called it Test1.exe.  I also compiled using a manifest which includes "AsInvoker" and called it Test2.exe. 

I then compiled another test project under good old VB6 containing only one line of code: MsgBox FSO.FileExists("Z:\MyDB.mdb") where FSO is an instance of a FileSystemObject. I also compiled the test once using a manifest including "RequireAdministrator" (called it Test3.exe) and once using "AsInvoker" (called it Test4.exe).

The results were:
Test 1 : False
Test 2 : True
Test 3 : True
Test 4 : True

By the way, all tests results return True when testing on Windows 7 and Windows XP. This issue is strictly with Windows 8.

Can anyone help me make sense of these results?

 

More details:
1. All test executables were digitally signed.
2. Of course, the drive is correctly mapped and I can drag and drop files with the mouse.
3. The folder targeted as Z is shared with Full Control for Everyone. 

4. The Windows user on the Windows 8 station is an Administrator. 
5. All firewalls and security systems were disabled for testing.
6. Tests were done on both Windows 8 Pro and Windows 8 Home, same results.

7. Login on both host and client stations is with the same Windows account and password.


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