[Bug 43651] New: Engine Prime: can only add tracks if under C: drive

https://bugs.winehq.org/show_bug.cgi?id=43651

Bug ID: 43651
           Summary: Engine Prime: can only add tracks if under C: drive
           Product: Wine
           Version: 2.15
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 59077
  --> https://bugs.winehq.org/attachment.cgi?id=59077
Log file adding a track via Z: drive (faulty)

Engine Prime is a music preparation application targeted at DJs who use Denon's
latest hardware.  It can be downloaded at http://www.denondj.com/engineprime

Engine Prime 1.0.0 starts up successfully if d3dcompiler_46.dll and
d3dcompiler_47.dll are disabled.  But a track can only be added to the
collection via the Filesystem Browser if it is accessed via the C: drive. 
Trying to add a track via the Z: drive (mapped to root) silently fails to add
the track to the collection.

Steps to reproduce:

* Clean wine prefix.
* Install Engine Prime 1.0.0 (link above)
* Copy an MP3 file of your choice to somewhere under drive_c.
* Copy another MP3 file of your choice to somewhere else on your filesystem
accessible via a drive mapped in Wine, e.g. the Z: drive
* Start Engine Prime as follows:
env WINEDLLOVERRIDES="d3dcompiler_46.dll=d;d3dcompiler_47.dll=d" wine
~/.wine/drive_c/Program\ Files\ (x86)/Engine\ Prime/EnginePrime.exe
* Observe empty music collection (try clicking on "Collection")

"Good" route:
* Select the Filesystem Browser
* Navigate to the folder containing the 1st MP3 file from earlier (under C:
drive)
* Click the folder to show the file in the main pane to the right
* Right-click the track, choose Add to Collection
* Click on Crates, then click on Collection
* Observe that the MP3 file has been added to the collection successfully

"Bad" route:
* Select the Filesystem Browser
* Navigate to the folder containing the 2nd MP3 file from earlier (under Z:
drive)
* Click the folder to show the file in the main pane to the right
* Right-click the track, choose Add to Collection
* Click on Crates, then click on Collection
* Observe that the MP3 file has *NOT* been added to the collection successfully

Logs for the good and bad route attached.