Problem opening a .txt file

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filterACspot.txt

I got a txt. file with data from an oscilloscope. Matlab does not open correctly the file. If I run:

fid=fopen('filterACspot.txt');
dataACspot=fprintf(fid,'%f',[4,12]);
fclose(fid);

it returns a 0 value. I tried to open 'filterACspot.txt' in matlab and copy one line straight into a vector. It works, returns a 1x20480 double, which is the size i expect. When I try to plot those vectors selected individually, y get the following error:

Error using plot

Data must be a single input of y-values or one or more pairs of x- and y-values.

All this leads me to believe the data in the text file, even though looks like regular numbers, is formatted incorrectly. But I have not found how to check and how to correct it. Any pointers? I attach the file. Thank you