Tucnak's outputs are compatible with EDI format and are saved to the .txt files with Tucnak's specific extensions which shouldl be ignored by contest commitee.
The export to plain EDI format with command Contest -> Export as EDI. Output is in file e.g. 02OK1KRQ.edi.
It's another output. Output file has suffix txt. This output is generating in OK VHF Activity contest format.
The main format for exporting contest log to general purpose log. If you have some questions to format output files or compatibility with logbook , please mail me