Hi,
I've answered my own question through some research. When in IIS 7 and above the maxAllowedContentLenghth attribute has to set under the <system.webServer> section in the web.config file for larger files. I found the info here:
http://www.webtrenches.com/post.cfm/iis7-file-upload-size-limits IIS 5 looks under the <system.web> section, which is where I had the maxRequestLength attribute set, and why the app worked in IIS 5.2 on the Windows Server 2003 box. Example...
For IIS 7 and above....
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="3524288000"></requestLimits>
</requestFiltering>
</security>
. . .
Me dumb dumb!
Thank you anyways guys!
Kind regards,
Randy Sullivan