File save caused new lines to be put in

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Hi,

I'm using OScommerce-2.2ms1.  I have a problem with editing and saving a text file thru their admin system.  It adds extra new lines after every line.

For example, I go to /catalog/admin/file_manager.php.  Click on any text file, click Edit.  Then i make edit and click Save.

The text file after a saved will have extra new line into it.

For example, the original file contains:
line1
line2
line3

The new file after save will become:
line1

line2

line3

Anyone knows what's wrong?

Thanks,
Wendy