The howtoslice.zip file you have requested: Tools and Utilites / Tutorials / How to Slice a Door Video Tutorial - 3.72mb is not available. Perhaps try browsing all files for the game F.E.A.R. and upload any files you want to share or are missing. This is the only information we could locate:
For more information on FEAR, visit Fear.filefront.com This has a series of video clips that will help you learn how to slice doors with WorldEdit. There is no narration with this, but there is a text file that explains it.