Hezký den,
zdroj je uveden třeba v souboru "readme.txt" umístěného ve složce aplikace LastActivityView.
Cituji:

Known Limitations
=================

This tool gathers information from various sources, including the
Registry, the events log of Windows, the Prefetch folder of Windows
(C:\windows\Prefetch), the MiniDump folder of Windows
(C:\Windows\Minidump), and more...
The accuracy and the availability of the information displayed by
LastActivityView might be different from one system to another. For
example, if the user or a software makes changes in the Registry, the
action time displayed by LastActivityView might be wrong, because it's
based on the modified time of some Registry keys.
Also, for every type of action/event, there is some limitation according
to the way that the information is saved in the system. For example, the
'Select file in open/save dialog-box' action is limited for one action of
every file extension, so if the user opened 2 .doc files with the
open/save dialog-box, only the last one will be displayed.