How do I add these files to my loop?

I have multiple files and I only want my Excel files added to the directory.

myDir = uigetdir('path'); %gets directory
myFiles = dir(fullfile(myDir));
M(length(myFiles),s)=zeros; %gets all wav files in struct
for k = 1:length(myFiles)
    baseFileName = myFiles(k).name;
    fullFileName = fullfile(myDir, baseFileName);
    A = readmatrix(fullFileName,'Whitespace',' []');
end

Answer 1

[Image Analyst]

Try this:

filePattern = fullfile(myDir, '*.xls*');
myFiles = dir(filePattern);