Logbook of the World
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LoTW Files and Icons

LoTW uses four kinds of files, distinguished by Filename Extension. On Windows, Windows Explorer displays these files with an Icon and Type:

Filename Extension Icon File Type Created By Usage
.tq5 Callsign Certificate Request TQSL Callsign Certificate Request File submitted to ARRL
.tq6 Callsign Certificate ARRL Callsign Certificate File referenced and managed by TQSL (cannot be backed-up, recovered, or moved to another PC)
.tq8 Digitally Signed Log TQSL or logging application Digitally Signed Log File submitted to LoTW
.p12 Personal Information Exchange TQSL Certificate Container File managed by TQSL; can be backed-up, recovered, or moved to another PC
.tbk TQSL Backup TQSL Backup File created by TQSL that contains all certificates, station locations, and preferences in a form that can be backed-up, recovered, or moved to another PC