Set the File adapter Processing Mode for "Set to Read-Only"
this will change the file property to read-only.
This will cause only new files to be processed.
This set to read only mode for sender file communication channel will process the fiels have write permission and change it to Read only to not to modify it later on.
this option is available for NFS only (Native file system)
Please reward points if it helps
You can try editing the read-only parameter of the file and then go ahead as you wish. If the file is in your own network you can use chmod command in the command prompt. Else if you are accessing file in the clients network, use some ftp tool to access the file and then change the parameter.