Direction for deburring and filing tools
Generally, when speaking of different types of files the cutting teeth on the grooves are oriented in different ways but are usually forward facing.  When pushed the teeth are able to cut the material properly. 

Most novice users tend to adopt a sawing motion twice as many passes with the file, thinking it will take half the time to do the work. Unfortunately not.

If the file is employed this way with cutting happening on the forward stroke, the teeth will bend causing permanent damage on the draw stroke.

Best thing is to research any tools and procedures before starting the project.  And find the right tool for the job.