Provide TAG file support
Some companies use TAG files to indicate the file is ready for sending / receiving.
ie. somefile.csv could only be half written to due to a failure (database timeout getting the data, etc). The file should not be transmitted because there is no somefile.tag file (empty file) indicating that the csv file is ready for transmission.
I would like to be able to specify the source extension "csv" and the matching tag extension "tag".