The file samplesubmission contains an example of a UTF-8 file which is in the correct format. You can use any APL system to participate in the contest, so long as you submit a file in this format, and the code runs in Dyalog APL when loaded.
The file contest2010sample.dyalog defines a web page which can be displayed using the MildServer which can be used to visualize the results of your work on the 2010 Programming Contest.
See the Task Descriptions page for more information on how to modify both these files in order to use them in the context of the Dyalog 2010 Programming Contest.