Have you downloaded it?
How are you trying to open it?
Try opening notepad and using File | Open.
If all the lines are scrunched together (like the Enter key was never used) the file was downloaded in binary mode, change your ftp program to 'automatic' or 'ascii' mode and download again.
Save it, rename the one on the server if possible-- add .old to the end of the name and then upload the one you just edited.