The exp file generally has the file name expX.txt, where X is the ID of the robot. Thus if the experiment had 2 robots there will be 2 files called, for instance, exp9.txt and exp12.txt.
Here is an example exp file. It is a log file containing a time ordered list of internal state changes for the robot. Each entry on a new line consists of the time (which matches with the time stamp in the tracking data file), followed by the new state 'signalling', 'imitating' etc. When imitating, the next entry in the file will give the movement-meme (from the meme_file) that has been selected to be enacted.
1276095845: signaling
1276095876: imitating
1276095876: Read Meme List
1276095877: 0 15 120 15 240 15
1276095877: Meme Chosen to be executed
1276095877: 0 15 120 15 240 15
1276095895: foraging
1276095913: checking
1276095916: waiting
1276095926: tracking
1276095943: recording
1276095944: Similar Meme
1276095944: signaling
1276095975: imitating
1276095975: Read Meme List
1276095975: 272 20 97 4 16 15 139 17
1276095975: Meme Chosen to be executed
1276095975: 272 20 97 4 16 15 139 17