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Editorial Team
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Asked: 2026-05-12T11:41:47+00:00

I am having problems downloading files possibly due to the file extensions not matching

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I am having problems downloading files possibly due to the file extensions not matching the actual file. What is happening is the File.Exists check is returning false for these even though the named file does exist. Is anybody aware of anything in IIS or even IE which would cause this? I have seen this with .txt, .exe. and .avi files. The .avi works of as long as the file really is an avi and not renamed from something else.

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1 Answer

  1. Editorial Team

    Ok, we have an answer…. I actually had double file extensions on the files that were not working but the option to hide known extensions was turned on (I guess by default). The .avi files looked the same as the others so I guess it was considering .avi to be an “unknown” file type. Whatever!

    The answer is on my other post here:

    Why is FileInfo showing an extra file extension?

    Thanks,
    James

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