ODBC and permissions on shared folders

Setup:
On my Mac, there is a folder whatever which I've shared with my Windows 8.1 virtual machine. Suppose Window has assigned the drive letter is W: to this folder.
I would like to set up an MS Excel file as a data source (I believe the ODBC folks call this a 'DSN').
I downloaded the 64-bit ODBC drivers from MS, because they didn't see fit to bundle them on Windows 8.
If I click through to where I would set up the DSN, I eventually get to a dialog box entitled 'ODBC Microsoft Excel Setup'.
Problem:
When I click on the 'Select Workbook...' button, see the Windows 3.1-version dialog box, and select w:\\psf\whatever from the Drives list, I get the error
w:
You don't have permission to open this location.
Contact the location's owner or an administrator to obtain permission.
As it turns out, the w: drive is not special. I get the same error for all shared folders.
Confusion:
The shared drive has read/write permissions in the sharing setup. If I go to w: drive (and any of its folders), I can use other Windows applications to read, create, and overwrite exiting files, so there really is no problem reading and writing to w:
If I go to Windows Explorer, right-click on the
whatever shared drive, and select the Properties item, the Read-only attribute is unchecked, so it seems there should be no problem here, either.
Even If I go to the Mac side and do a chmod ag+w to change the permissions of the whatever folder to 777, I still get the permissions problem.
Questions:
How do I convince Windows that I can read/write to the w: drive?
Is this an ODBC problem, Parallels problem or a Windows problem?
How would I figure this out?
 
Hi Bill,
In order to fix the issue you stated, please follow the steps below:
1. Remove Parallels Desktop, refer kb.parallels.com/122653
2. Run repair disk permission on the Mac hard drive.
  • Launch Applications -> Utilities -> Disk Utility
  • Select Macintosh HD on the left panel and click Repair Disk permissions
3. Re-install Parallels Desktop, refer http://kb.parallels.com/122647
Note: Remove and re-installing Parallels Desktop will not affect your Virtual Machine.
 
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