FtExist resource

Defines the default behavior for IND$FILE file transfers when the destination file already exists. The value keep means that the transfer will be aborted (or if invoked interactively on x3270 or wx3270, the user will be prompted to confirm the file is to be overwritten). The value replace means that the file will be overwritten unconditionally, and append means that the new file will be appended to the old file.