### 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

##### 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.

##### Allow Nonamateur Callsigns

The Allow nonamateur call signs checkbox lets you to choose whether TQSL should treat a nonamateur call-worked as an error. LoTW does not accept nonamateur callsigns, so this option is disabled by default.

##### 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.