Since you have said it is an old programme, I am not sure but hope it helps:
This directory is what is known as a
junction point[
^], may be relate dto this issue
From the MSDN documentation:
These junction points can be identified as follows:
They have the FILE_ATTRIBUTE_REPARSE_POINT, FILE_ATTRIBUTE_HIDDEN, and FILE_ATTRIBUTE_SYSTEM file attributes set.
They also have their access control lists (ACLs) set to deny read access to everyone.
Applications that call out a specific path can traverse these junction points if they have the required permissions. However, attempts to enumerate the contents of the junction points will result in failures.
Good luck