nice - I made a similar thing with Applescript for OS X if Mac people want something like this.

property toolPath : "/Applications/Autodesk/maya2009/Maya.app/Contents/bin/imf_copy"

on run {input, parameters}
set originalItem to (first item of input as alias)
set itemInfo to info for originalItem --'info for' is deprecated, but I personally hate System Events
set nameExtension to name extension of itemInfo
set destPath to (text 1 thru -((length of nameExtension) + 1) of (POSIX path of originalItem) & "map")
do shell script toolPath & " " & quoted form of POSIX path of originalItem & " " & quoted form of destPath

end run