Justice that adds to bottom of the text, is there a way to add to beginning of the text file?
You'd have to (using a batch):
1. write your line of text to a new file
2. write the old file to the new file
3. delete the old file
4. rename the new file to the old file
Or easy enough using a script (VBS,JS,AiT,AHK, etc) to use concatenate the two (in the correct order) and overwrite the original file.
But reading your original question I thought you were wanting to write to a specific Wiki page? If you use the Original Gadfly
Database Type then each Page/Word is saved as a different file. Then you'd be able to add text to the end of the file.