The extra programs are conversion programs.

Corntabl converts from Cornell format (used in Decorana, Twinspan)
to TABLEFIT format.

Tablcorn converts from TABLEFIT format to Cornell format

ULM_CORN.txt is Ellenberg meadow dataset in Cornell format
ULM_MEAD.txt is Ellenberg meadow dataset in TABLEFIT format

They can be converted from one to the other by Tablcorn and Corntabl
Note that the Ulm meadow dataset contains a number of non-British species.
Refer to Appendix in the manual for more information about these.
