.LOG extension
From TED Notepad
This feature was implemented as a demand for the capability of the original Windows Notepad: a log appending feature.
To append a log to a document each time it is opened, type the .LOG extension, on the first line of the document. It must begin at the very left margin. Also make sure to use all uppercase letters and to include the period.
When a document is loaded and this extension is found at its beginning, an actual time/date stamp will be appended to the document using the Time/Date tool.
Na takuto featuru by to chcelo hadam i poriadnu davku kofoly, hm? :-)