MATLAB: How to change file extension to ‘.xlsx’ BUT keep original files

change extension

Hello,
I am trying to change files with extension '.stp' to '.xlsx' while also keeping the original '.stp' files. I have code that replaces the '.stp' files with '.xlsx', but it does not keep the originals:
files=dir('*.stp')
for i=1:length(files)
    filename=files(i).name;
    [pathstr, name, ext] = fileparts(filename);
    movefile(filename, fullfile(pathstr, [name '.xlsx']))
end
Also, for some reason I am unable to open the resulting '.xlsx' files. However, when I write them to '.xls' they open with no problems. This is a problem because I need the files '.xlsx' format. If anyone knows how to solve this problem as well, it would be greatly appreciated.
I am running Matlab 2013a on a Mac.

Best Answer

Use copyfile() instead of movefile().
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