Insert the date and time wherever your curson is in your document by going through Insert, Date and Time, and choosing the format. Just select the text and drag it to its new location. As you move the cursor, you'll see a little box underneath it, showing that the text is being moved. The default is usually .DOC, which seems to be proprietory for MS Word. Unicode is for documents written to display a variety of foreign languages and technical symbols, and won't be used by the vast majority of us.
Most applications offer the commands necessary to change their default directories.
For example, in Microsoft Word, you can select Tools, Options, click the File Locations tab, and so on. First, locate the shortcut you use to open a program. Right-click the shortcut, select Properties, and in the resulting dialog box, click the Shortcut tab. Notepad is a handy little text editor that some of us like to ignore. For another, it only uses a tiny bit of system resources, which comes in handy when you want to take notes or annotate something, and other apps are sucking your system dry.