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.net with FileInfo for large files

I am trying to get the file size of large files (some are over 1 gigabyte) using FileInfo. It works but takes about 20 seconds. Actually all I need is to find out if the file is of a certain size, for example 100mb. Is there a faster way to do this?

New System.IO.FileInfo(ProcessPath).Length

Edit: BTW, the file I'm using for testing is a 1.6 gigabyte executable installer. So my guess is that every file in the installer is readable and that is why it takes so long. Is there a way to disable the timeout after 5 seconds or so, since if it takes more than 5 seconds we can safely assume it's a large file?

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