How to import a file using only part of the name, such as an index at the begin of filename?

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Emerson De Souza
Emerson De Souza 2013-1-21
INTRO Hi, I have multiple text files named as below:
C:\Users\EMERSON\Desktop\1\1_2013-01-21__15-35-22.txt
C:\Users\EMERSON\Desktop\1\2_2013-01-21__15-35-23.txt
C:\Users\EMERSON\Desktop\1\3_2013-01-21__15-35-24.txt
C:\Users\EMERSON\Desktop\1\4_2013-01-21__15-35-25.txt
C:\Users\EMERSON\Desktop\1\5_2013-01-21__15-35-26.txt
C:\Users\EMERSON\Desktop\1\6_2013-01-21__15-35-27.txt
C:\Users\EMERSON\Desktop\1\7_2013-01-21__15-35-28.txt
The file name is made of three components: i) index k=1:arbitrary, ii) date, iii)hour.
And I want to import/load these files using only the first index (1,2,3,4,5,6,7). So I wrote:
for k = 1:1;
fid =fopen(['C:\Users\EMERSON\Desktop\1\',num2str(k),'~.txt']);
A=textscan(fid,'%f %f %f %f %f %f ');
fclose(fid);
end
For instance I use k=1:1 only to test if one file is imported correctly, later k=1:arbitrary.
Problem: I obtain the following error:
Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.
I wonder if someone could tell me how to correct the first command line (fid=fopen....).
Thank you in advance for your attention
Emerson

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Walter Roberson
Walter Roberson 2013-1-21
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Cedric
Cedric 2013-1-22
编辑：Cedric 2013-1-22
There is certainly a function that will allow sorting according to what you need in one shot. Here would be one way to do it "by hand" until someone tells you how to do it properly:
txtFiles = ... (the way you define it)
[~,id] = sort(cellfun(@(n)sscanf(n,'%d_'), {txtFiles(:).name})) ;
for k = 1 : numel(txtFiles)
baseFileName = txtFiles(id(k)).name ;
...

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