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copied!<p>I know I've read about this somewhere before, but the best I could find right now was this reference to it in <a href="http://blogs.msdn.com/oldnewthing/archive/2007/12/17/6785519.aspx" rel="nofollow noreferrer">Raymond Chen's blog post</a>. The point is that Windows keeps a short (8.3) filename for every file with a long filename, for backward compatibility, and filename <strong>wildcards are matched against both the long and short filenames</strong>. You can see these short filenames by opening a command prompt and running "<code>dir /x</code>". Normally, getting a list of files which match <code>????????.tif</code> (8) returns a list of file with 8 or less characters in their filename and a .tif extension. But <strong>every file with a long filename also has a short filename with 8.3 characters, so they all match this filter</strong>.</p> <p>In your case both <code>GZ96A7005.tif</code> and <code>GZ96A7005001.tif</code> are long filenames, so they both have a 8.3 short filename which matches <code>????????.tif</code> (anything with 8 or more <code>?</code>'s).</p> <p>UPDATE... from <a href="http://msdn.microsoft.com/en-us/library/wz42302f.aspx" rel="nofollow noreferrer">MSDN</a>:</p> <blockquote> <p>Because this method checks against file names with both the 8.3 file name format and the long file name format, a search pattern similar to "<code>*1*.txt</code>" may return unexpected file names. For example, using a search pattern of "<code>*1*.txt</code>" returns "<code>longfilename.txt</code>" because the equivalent 8.3 file name format is "<code>LONGFI~1.TXT</code>".</p> </blockquote> <hr> <p>UPDATE: The MSDN docs specifiy different behavior for the "<code>?</code>" wildcard in Directory.GetFiles() and DirectoryInfo.GetFiles(). The documentation seems to be wrong, however. See <a href="https://stackoverflow.com/questions/963279/c-using-directory-getfiles-to-get-files-with-fixed-length/963289#963289">Matthew Flaschen's answer</a>.</p>

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