### Setting TQSL Options

To inspect or change TQSL's options, select the File menu's Display or Modify Preferences... command (on OS X, select the Application menu's Preferences command) to display its Preferences dialog; this dialog's Options tab provides control over several settings that govern TQSL's operation:

- Specify ADIF and Cabrillo File Extensions
- Enable automatic Backup File creation on termination
- Allow Nonamateur Callsigns
- Prompt for QSO Date Range
- Open ADIF files in ADIF editor
- Display details of duplicate QSOs when signing a log
- Display status messages in a separate tab

##### Specify ADIF and Cabrillo File Extensions

Because there are no standard file extensions (.XXX) consistently used for ADIF AND Cabrillo files, TQSL lets you specify the extensions used on your system for each file types. The Select File to Sign and Upload and Select File to Sign and Save dialogs set their Files of type selectors based on the extensions specified on this tab:

In the example shown above, files whose names end in `.log` or `.cab` will be treated as Cabrillo files, while those with names ending in `.adi` or `.ADI` are ADIF files. When using an operating system like Windows that doesn't distinguish case in file names, the two ADIF entries shown in this example would be unneccessary.

##### Enable automatic Backup File creation on termination

If you want TQSL to automatically create a Backup File when it terminates, check the Allow automatic configuration backup box, click the Browse button to the right of the Backup File Folder textbox, and use the Browse For Folder dialog that appears to select the folder in which Backup Files will automatically be created when terminating. The most recent Backup File created on TQSL termination will be named `tqslconfig.tbk`. TQSL will automatically retain the number of previous Backup Files specified by the Number of Backups to retain setting, deleting the oldest Backup Files in excess of this setting. Retained Backup Files will include the date and time of their creation in their filename.

##### Allow Nonamateur Callsigns

The Allow nonamateur call signs checkbox lets you to choose whether TQSL should treat a nonamateur call-worked as an error. An amateur callsign must meet these requirements:

- contains only the letters A through Z, the digits 0 through 9, and the slash character
- contains at least one number and one letter
- is at least three characters in length
- does not begin or end with a slash character
- does not begin with 0
- does not begin with 1 unless it begins with 1A, 1M, or 1S

LoTW will not accept a QSO whose callsign does not conform to the above requirements so you should leave TQSL's Allow nonamateur call signs box unchecked.

##### Prompt for QSO Date Range

This checkbox determines whether TQSL will display the QSO Date Range dialog when Submitting a Log File to LoTW via the Internet or when Submitting a Log File from a Computer without Internet Access.

The QSO Date Range dialog can be used to prevent QSOs already submitted to LoTW that haven't been subsequently modified from being submitted again, sparing LoTW from processing QSOs that have already been processed.

##### Open ADIF files in ADIF editor

If this box is checked and TQSL is started with a command line that specifies a file with an .ADI extension but does not specify -q or -x switches, then TQSL will display the contents of the specified ADIF file in its ADIF Editor instead of signing the contents of the ADIF file; if this box is not checked, then when started from a command line that specifies an ADIF file, TQSL will always sign the files contents.

##### Display details of duplicate QSOs when signing a log

If, when signing and uploading a file or signing and saving a file, TQSL encounters QSOs that have already been submitted to LoTW, then if this box is checked the details of each duplicate QSO will be reported in the Status Log; if this box is not checked, no details will be reported.

##### Display status messages in a separate tab

With this box unchecked, TQSL displays status messages in a Status Log pane below the three Log Operations, Station Locations, and Callsign Certificates tabs:

Enabling this option and then restarting this TQSL adds a fourth Status Log tab to the right of the other three. This enables more Station Locations and Callsign Certificates to be visible without scrolling:

Any change to the Display status messages in a separate tab option will take effect after TQSL is next restarted.