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In order to play Civilization V in DX9 mode I have to verify the file integrity, and Steam downloads a file.

Any idea why I have to do this in order to play?

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up vote 0 down vote accepted

This is just a feature to ensure that downloaded files are not corrupt and is usually used to attempt and troubleshoot major glitches that could be caused by corrupt files. Are you having an issue? If so add more detail and I will attempt to update my answer with more information.

EDIT: Try disabling UAC, I had an issue where Risen would not activate with the product key when UAC was enabled at even the 2nd to lowest level, had to disable it entirely.

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The issue is that I can't play without verifying first... – TheXed Nov 20 '10 at 4:57
@TheX Every single time? I.e., even after verification has completed successfully once? – deceze Nov 21 '10 at 9:41
Steam should verify a file once (and only once) after it has downloaded, this protects your computer from using a corrupt or damaged files. If you find they steam is trying to verify it each time, either delete/re-install the game/steam or post a bug report to steam. – Akusete Nov 24 '10 at 22:50
@TheX see my edit – ioSamurai Nov 30 '10 at 15:52
I will give that a try. – TheXed Nov 30 '10 at 17:36

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