MATLAB: I am unable to understand the code

MATLABscript

I am new to Matlab and I have taken an introductory course in it, I am currently reading someone's code to recreate mine, can someone kindly help explain line 7 of the code below.

direc = dir(['C:\Documents and Settings\All Users\Documents\NeuroScript\PAN\107\Digitizer_trials\*.HWR']);
filenames = {direc.name};
filename = filenames{trialnumber};
[pathstr, name, ext] = fileparts(filename);
names = strrep(name,'10704101F','');
names = str2num(names);
data = dlmread(['C:\Documents and Settings\All Users\Documents\NeuroScript\PAN\107\Digitizer_trials\' cell2mat(filenames(trialnumber))],'',1,0);

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Thanks

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