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Tim,
Unfortunately, we have no alternatives available. It is very sad.

In my opinion some solutions there should be when Jimmy says

when DBF is used in Share Mode only Once, it will use SMB "Exlusive Locking" Mode
as soon when DBF was opened second Time it will switch into "Opportunistic Locking"

... than this clarifying example


when DBF is used in Share Mode only Once, it will use SMB "Exlusive Locking" Mode
as soon when DBF was opened second Time it will switch into "Opportunistic Locking"


Jimmy probably came close to the problem but in my opinion the problem is not dbf file but cdx file

... when DBF is used in Share Mode only Once, it will use SMB "Exlusive Locking" Mode
as soon when DBF was opened second Time it will switch into "Opportunistic Locking" Mode https://learn.microsoft.com/de-de/windows/win32/fileio/opportunistic-locks
it have to do with Cache which in "Opportunistic ...

... data using different
instruction order, i.e. DBSKIP(0)/UNLOCK/COMMIT,...
The only problems which can appear are in OS or FS, i.e. the
infamous opportunistic locks is MSDN networks which may completely
break applications using concurrently the same files and synced
by file range and file access locks ...