Turning 64 Rows And 18 Columns Into One Row With 1152 Columns

I have individual data files (one for each participant). Each file has 64 rows (one for each trial in an experiment) and 18 columns (one for each variable). I would like to create a master data file in which each participant is represented in a single row. I will then have 1152 columns (18 columns for the variables, repeating 64 times so that each trial is represented).

In other words, my individual data files look something like this:

Participant 1 (title of data file)

Trial/var1/var2/var3
1 55 43 65
2 54 43 56
3 33 23 56

and I want to compile all the data into a single file that looks like this:
Participant/Trial1_var1/Trial1_var2/Trial1_var3/Trial2_var1/Trial2_var2/ ...
1 55 43 65 54 43
2 . . .

I know how to record macros and use IF, THEN, AND, & SUMIF statements creatively, but that's about it. I was hoping to record a macro that I could use on each individual data file to turn it into a single row, and then paste each row into the master file.