FileExtension["file"] gives the file extension for a file name.
FileNameDepth["file"] gives the number of path elements in the file name " file".
FileNameDialogSettings -> {opt -> val} is a global option that specifies settings for the Insert File Path dialog box.
FileNameDrop["name", n] drops the first n path elements in the file name " name".FileNameDrop["name", -n] drops the last n path elements in the file name " ...
FileNameSetter[name] represents a file name setter which displays as a Browse button and when clicked brings up a system file opening dialog, starting from the location ...
FileNames[] lists all files in the current working directory. FileNames[form] lists all files in the current working directory whose names match the string pattern form. ...
FileNameSplit["filename"] splits a file name into a list of parts.
FileNameTake["name"] gives the last path element in the file name " name".FileNameTake["name", n] gives the first n path elements in the file name " ...
FilledCurve[{segment_1, segment_2, ...}] represents a filled curve consisting of segment_1 followed by segment_2 etc. FilledCurve[{component_1, component_2, ...}] represents ...
FillingStyle is an option for ListPlot, Plot, Plot3D, and related functions that specifies the default style of filling to be used.