Here's more info:
File Monitoring
System Restore monitors file operations for a core set of system and
application files specified in
systemroot\System32\Restore\Filelist.xml. System Restore records
changes to the original file and sometimes copies it to a hidden
archive before Windows XP Professional overwrites, deletes, or
changes, the monitored file. System Restore does not monitor the
following files and folders:
The virtual memory paging file.
Personal user data, such as files in My Documents, Favorites, Recycle
Bin, Temporary Internet Files, History, and Temp folders.
Image and graphics files, such as those with .bmp, .jpg, and .eps
extensions.
Application data files with extensions not listed in
systemroot\System32\Restore\Filelist.xml such as .doc, .xls, .mdb, and
..pst.
Restore Points and Restore Point Management
Restore points contain the following two types of information:
A snapshot of the registry.
Certain dynamic system files.
System Restore creates restore points according to the following
system events, user actions, or time intervals.
https://www.microsoft.com/technet/t...prodtechnol/winxppro/reskit/prmb_tol_fngj.asp
Andrej
