Try this:
T = readtable('RD-120101-031900.txt', 'PreserveVariableNames',1);
FirstFiveRows = T(1:5,:); % Sample Input Result
writetable(T, 'RD-120101-031900.xlsx'); % Write Excel File
T2 = readtable('RD-120101-031900.xlsx', 'PreserveVariableNames',1); % Read Excel File
FirstFiveRows2 = T2(1:5,:); % Sample Input Result
See the documentation for the various functions for details on their use.
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