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Tracking opening and closing of files


Is there a possibility to get notified by the operating system when a file in a certain directory is opened, closed? I need those notifications in realtime.


Yes, Microsoft provides an API for this:
Win 32 API

If you use an older version of Delphi then you could use the free RXtools (aka 'RXlib'). They include a directory monitoring component which will get notified with an event. The component's name is TRxFolderMonitor and it works very well. The source code is available but I think it has not been ported beyond Delphi 5.
See the link above how to install RXLib.

Generated 12:02:43 on Sep 23, 2019