On the menu bar, go to File > Transfer Type.
Choose ASCII, Binary, or Auto.
On the menu bar, go to Tools > Global Options.
Expand Transfer Settings to see ASCII Types.
Click ASCII Types.
Type the file extension of the file you want to transfer in ASCII mode in the ASCII extensions box. If the extension is already in the list, skip steps 5 and 6.
Click Add.
Click OK.
Proceed with transfers.
On the menu bar, go to Tools > Global Options.
Expand Transfer Settings to see ASCII Types.
Click ASCII Types. A list of the file types that are transferred in ASCII mode will be displayed. If the file type you want to transfer is not displayed, click OK and proceed to step six. If it is displayed continue with step 5.
Click the extension of the file you want to transfer in binary mode.
Click Remove.
Click OK.
Proceed with transfers.
Auto is the default transfer type, and sends files in the mode specified for each file's extension. All extensions are sent in binary mode unless they are listed in Global Options > Transfer Settings > ASCII Types.
SSH2 servers do not support ASCII transfers (see http://www.ssh.com/tech/archive/secsh.cfm). CuteFTP Pro adjusts for this by automatically stripping line feeds prior to uploads and restores them during downloads (prior to the file getting written to disk).