Linux User/Group Overwrite

I am copying updated files via WinSCP from my desktop to a remote server.  I have one file that is problematic, when I copy the file over, it automatically changes the user and group, other files are fine?? Here's what it looks like in Putty:
drwxrwx---      mainuser          maintools      4096      Jun  20 2014    Directory1
drwxrwx---      mainuser          maintools      4096      Jul  15 2014      Directory2
-rwxrwx---      mainuser          maintools      18080      Jun  20 2014    File1
-rwxrwx---      mainuser          maintools      18080      Jun  20 2014    File2
-rwxrwx---      otheruser    user             18080      Jun  20 2014    File3

The problem file is the last one. The original file was created as mainuer/maintools but when I copy a fresh version via WinSCP, it resets the user/group as shown.  all other files move correctly
kevbob650Asked:
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Anil_dasmalaCommented:
Please check if this question from winscp forums helps
http://winscp.net/forum/viewtopic.php?t=13430
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kevbob650Author Commented:
So sorry, I never saw the response!  Thanks
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Anil_dasmalaCommented:
np, Thanks.
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