Small APRS Tracker manual:
http://www.oh5x.com/files/Tracker_Ver_2_1.pdf

Programming guide:
http://www.oh5x.com/files/Tracker_Programming.pdf

Opentracker+ manual:
http://www.argentdata.com/support/otplus-manual.pdf

Opentracker configuration software:
https://www.argentdata.com/support/firmware/otwincfg.exe

Sample cfg file:
www.oh5x.com/files/sample.cfg
Download this file to your computer by right-clicing it and save as...
Open it with otwincfg software to see how it is configured.
Use OFFLINE button of the software to open.