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Hi--
If you are hosted on a Linux Server, you can CHMOD your file permissions via your FTP Client. If you are on a WinServer then you need to contact your host tech support regards how to go about CHMOD in the CP ver. you have. Most WinServer CPs I have dealt with only have limited parameters for file permissions on their File Managers.
For instance, in WS_FTP,(Linux/Unix) you right click on your file, then >Properties> Change Modes and change them there on the Server side.
Hope this is what you are looking for and helps you.