Undocumented function "Files(,)"

Hi,

Just found by accident that in Mathcad 11 the function Files(CWD) returns a vector of strings, where each strings holds a filename that exists on the current path (due to CWD), you can supply any valid path to the function. Note that the function name is spelled with a capital F: "Files" is defined , "files" is undefined.

The function accepts a second argument, which must be a string apparently, and has something to do with file type. Has anyone figured out how to use that second argument?

Luc