A log file in Cabrillo format implies that it was from a contest operation. If you use any of the popular contest logging programs you not only can export a Cabrillo file for your contest log entry, you can also export an ADIF file as well. I contest a lot, and this is what I do. I export a Cabrillo file and an ADIF file. The Cabrillo file is sent in for my contest entry, and the ADIF file is then imported in to my N3FJP log file and N3FJP can upload that to LoTW. That way all of my contacts are in one file. Not only is it easy to upload to LoTW that way, it greatly simplifies responding to QSL requests. I don't have to hunt down the contact that needs confirmed in a dozen individual contest logs.