User has an Unicode UTF-16 input file and trys to read
it line-by-line and write it back to a new file.
With the read line the program does nothing.
code example: 
...
ln=fi.readline()
fo.write(ln)
...

In linux this code works perfectly with the input
UTF-16 type file.
In windows Python put an extra \x0D into the EOL.

EOL should look like: 0D 00 0A 00
In windows it will be: 0D 00 0D 0A 00

Please inform when correction is available.

Logged In: YES 
user_id=21627

Can you provide a small test program that demonstrates the
problem?
I cannot reproduce it:

>>> f=codecs.open("f.txt","w",encoding="utf-16")
>>> f.write(u"Hallo\n")
>>> f.write(u"Welt\r\n")
>>> f.close()
>>> open("f.txt").read()
'\xff\xfeH\x00a\x00l\x00l\x00o\x00\n\x00W\x00e\x00l\x00t\x00\r\x00\n\x00'

This looks right to me.

Logged In: YES 
user_id=1352468

I made the wrong file open without codecs. With codecs it is
opening OK and works correctly. Sorry for my beginners
problem but in the documentation regarding Unicode is not
too clear for me. (I think the problem is probably with me).