Adding PC Filename Extensions to Macintosh Filenames

[hokiegal99]

I've written a small script (with much help from this list) that 
searches through a directory for files without a PC filename extension 
like .doc .xls and then adds them. The reason for writing the script is 
that I'm migrating several dozen Mac users to PCs over the next few 
months and many of the Mac files do not have PC filename extensions. 
There are thousands of these files. The script runs on a Linux ftp 
server where the files are upload to.

In testing, the script works OK. It needs work, for example I need to 
make certain that the strings I'm searching for to identify file types 
are correct. This would be easier if I could assign more than one string 
to string.find. I'm considering doing this:

setpath = raw_input("Enter the path: ")
for root, dirs, files in os.walk(setpath):
    old_fname = files
    for old_fname in files:
       new_fname = old_fname + '.xls'
       exclude = string.find(old_fname,'.xls')
       x = string.find(old_fname,'Excel.Sheet.')
       y = string.find(old_fname,'Microsoft Excel')
       z = string.find(old_fname,'Worksheet')
       p = x, y, z
       if p >= 1 and exclude == -1:
          newpath = os.path.join(root,new_fname1)
          oldpath = os.path.join(root,old_fname)
          os.rename(oldpath,newpath)
          print oldpath
          print newpath

The script as it exists now is attached to this email. Please critique 
it and let me know how I can make it better or more accurate. All advice 
is welcome both positive and negative. I'd especially like to hear for 
people who could show me how I might make the script smaller and more 
efficent and ways in which I might ID file types more accurately.

Thanks!!!
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