Avoid including words that are clear from a/the file type or otherwise obvious.
Not recommended: presentation_for_google_summer_of_code_2011.ppt Recommended: summer_of_code_2011.ppt
(The above sentence, as I understand, could be rewritten as "Avoid including words that are clear from the type of a/the file or otherwise obvious.")
This is an excerpt from my manual about naming files. Which article should I use, a or the? I know that if I talk about a specific file, I should use the, but it doesn't directly answer the question itself.