Running prowin32.exe from an OS-COMMAND session returns an error regarding promsgs when using Windows substitute drives

Running prowin32.exe from an OS-COMMAND session returns an error regarding promsgs file when using Windows substitute drives.
The problem only occurs if the main Progress session has not been started from the substitute drive.
The current directory for the substitute drive is changed to "proedit\win" if the main Progress session has not been started from the substitute drive.

The %DLC% path has been substituted by a drive letter using the Windows "subst" command.

Steps to reproduce:

1) Within a Proenv session run the following: subst H: %DLC%
2) Make a copy of %DLC%\bin\progress.ini and change all references of %DLC% to H:\ 
3) Change to C: drive, e.g. use c:\ Dos command. 
4) Run: H:\bin\prowin32 -ininame H:\bin\progress2.ini -basekey "INI" 
5) Execute OS-COMMAND to open a new DOS window.
6) In the new DOS window run: H:\bin\prowin32 -ininame H:\bin\progress2.ini -basekey "INI"
7) In the new DOS window change to the H: drive and notice that the current directory has changed to "H:\proedit\win".

The exact cause is not known at this time.

Until the fix is available, use the workaround below.

Call a batch file that first changes to the substitute drive, for example the batch file may look like this: 

C:\Users\user1> cd H:\ 
C:\Users\user1> H:\bin\prowin32 -ininame h:\bin\progress2.ini -basekey "INI"