Create mentalray .map files from all existing non map files

def createMapFiles():
    import maya.cmds as cmds
    import maya.mel as mel
    import time, os, subprocess
    allFileNodes = cmds.ls(type='file') # look for file nodes
    nonMapFiles = []
    for curFile in allFileNodes:

        cmds.setAttr (curFile + '.filterType', 0) # turn off the damned filtering
        fileName = cmds.getAttr(curFile + '.fileTextureName') # get the filename
        if fileName != '': # test for stupid user
            fileExt = os.path.splitext(fileName)[1].lower()[1:] # get the extention
            if fileExt != 'map' : # test for anything but map files
                nonMapFiles.append(curFile)
    for curFile in nonMapFiles:
        curFileName = cmds.getAttr(curFile + '.fileTextureName') # get the filename
        newFileName = curFileName.replace(os.path.splitext(fileName)[1].lower()[1:],'map')
        bin_path = 'C:/Program Files/Autodesk/Maya2012/bin' # change this to the correct installation path of maya
        cmd = '%s/imf_copy -r -p %s %s' % (bin_path,curFileName, newFileName) # create the output command
        subprocess.call (cmd) # run the command
        if os.path.exists (newFileName) : #make sure the map file exists
            cmds.setAttr(curFile + '.fileTextureName' , newFileName, type='string') # set the attr to replace the file with the map
        else:
            print 'Error with map conversion for %s - %s' % (curFile, curFileName) # was it messed up?  tell the user

createMapFiles()