Учитывайте под какой учетной записью происходит редактирование.
Окна. 2je0n, опять же гуй, что бывает не всегда приемлимо. Альтернатива, FileTouch.exe (16kb)

Usage: FileTouch [/?] [/W] [/A] [/C] [/S] [/D date] [/T time] filemask

Command line parameters:
/? Print this help.
/W Change file modification date (Write date). This is the default.
/A Change file last access date (Access date).
/C Change file creation date (Create date).
/S Touch subfolders. By default only files are touched.
/D New file date. This switch must be followed by a date in mm-dd-yyyy format. If /D switch is not specified the current system date is used.
/T New file time. This switch must be followed by a time in hh:mm:ss 24-hour time format. If /T switch is not specified the current system time is used..
filemask The file mask to be used for the file search. Example: *.txt.