I just stumbled across this question; you can use the following to disable the cache on a specific file:
<configuration>
<location path="path/to/the/file">
<system.webServer>
<staticContent>
<clientCache cacheControlMode="DisableCache" />
</staticContent>
</system.webServer>
</location>
</configuration>
(Note that the path is relative to the web.config file)
Alternatively, place the single file in a directory on it's own, and give that directory it's own web.config that disables caching for everything in it;
<configuration>
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Cache-Control" value="no-cache" />
</customHeaders>
</httpProtocol>
</system.webServer>
</configuration>
[Both tested on IIS7.5 on Windows 7, but you'll have to confirm that it works OK on Azure]
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