Data Source Files Showing As Folders - Invalid Path Error

[#1]

Please see below for screen shots.  I noticed an invalid path error when creating a new app and connecting it to an xlsx file that had previously been used by another Qlik app.  The file appears in the Select File window, but the icon next to it indicates that it is a folder object.  This seems to apply to files that have been used as data files in previous apps.  The files that appear with the standard 'file icon' in the Select File window are all new xlsx files that have not yet been used in a Qlik app.  In the screen shots, the two files titled 'AgC Customer Street Address Extract - Business Location - old Geo Table.xlsx' and 'AgC Sample Data 04082016 Super Groups.xlsx' appear as folder object types (1), but are in fact xlsx files (2, note file names and paths), but selecting one returns an invalid path error (3).  Selecting one of the files with the normal 'document' icon does not produce this error.

Is this a bug?  Has anyone else seen this behavior?  Are there any known workarounds or ways to prevent this?  I have been able to reproduce it across multiple PCs but have not found any discussions about it so far.  Any feedback or suggestions would be much appreciated.

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[#2]

What format does Qlik require for UNC paths?  \\Server\Volume\File format worked for browsing to the data sheet location, but selecting any of the individual files produces the Invalid Path Error.

Copying this folder locally does not produce the same results - I can add the same local source files to multiple Qlik apps.  The only visual difference is that the local icons appear as 'file' icons in Qlik, whereas the files in the shared folder (once they have already been used as a data source for a previous app) appear as 'folder' icons:

Local Folder:

Shared Folder:

[#3]

I'm running Qlik Sense Desktop stand alone, so there are no server/service accounts in the mix.  I am running Qlik Sense Desktop as my own Windows account, which is the same account that has access to those files through Explorer.

The files were previously used as a data source in a previous Qlik app, which would not be possible if it were a permissions issue.