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PODirectory.GetFiles - different output dependent on OS
 

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    <p>I have a simple program. It runs .NET 4.5 and is built in Visual Studio 2013.</p> <p><code>D:\\MyDir</code> is full of <code>.xlsx</code> files and no <code>.xls</code> files. When I run the program on Windows 8.1 x64, the filter for <code>*.xls</code> returns no results. When I run the same program, with the same .NET version on Windows 7 x86, the <code>*.xls</code> filter returns the same results as the <code>*.xlsx</code> filter.</p> <p>The test folders on both systems definitely contain the same data.</p> <p>Am I missing something, or is this a bug in .NET and/or Windows?</p> <p>The respective code:</p> <pre><code>using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; namespace throw_test { static class Program { static void Main() { int fileCount1 = Directory.GetFiles("D:\\MyDir", "*.xlsx").Length; int fileCount2 = Directory.GetFiles("D:\\MyDir", "*.xls").Length; Console.WriteLine("File Count 1: " + fileCount1); Console.WriteLine("File Count 2: " + fileCount2); Console.Read(); } } } </code></pre> <p><strong>Edit 1</strong></p> <p>When I navigate to the directory using the command prompt in Windows 8.1 x64:</p> <ul> <li><code>dir *.xlsx</code> returns all files as expected</li> <li><code>dir *.xls</code> returns 'File Not Found'</li> </ul> <p>Windows 7 returns the expected files on both of the above commands.</p> <p>My guess is that .NET uses this command under the hood, thus the above results?</p>
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      1. VTUpMod
    1. COLooks like a built-in Windows magic for application compatibility. Needs further investigation.
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      1. USogggre
    2. CO@ogggre its not any compatability for 8.1, its right in the MSDN for GetFiles "*... given two files, `file1.txt` and `file1.txtother`, in a directory, a search pattern of `file?.txt` returns just the first file, while a search pattern of `file*.txt` returns both files.*" his 8.1 machine is acting incorrectly and the results should have shown up.
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      1. USScott Chamberlain
    3. COI can't find the reference (I think it may have been a Raymond Chen post), but IIRC, this is a "feature" of old versions of Windows that goes back to the dos era.
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      1. USJoel Coehoorn
 

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