when testing Example.exp.xml at the experimenter side, the following files should be copied to the participant side under the same folder with UniExpClient.exe:
aaa.jpg
bbb.mp3
Training.mp4
ExpIntrod.mp4
Blast.mp3
Alarm.mp3
Thunder.mp3

NASA-TLX.ques.xml is an example of questionnaire definition, but doe not use image, audio  and video elements. 
The other file are for reference. Without the corresponding task programs, the dedicated commands inside exp.xml files will not be executed at the participant side.
