HTMLFile relative path converted to absolute path with \\?\ prefix

Good morning.

We are migrating a CGI legacy web application running on W2K to W2K8. In the new environment after recompiling the browser displays errors like this:

Cannot open file "\\?\C:\Project\Alfa\web\common\pages\entrance.htm". The filename, directory name, or volume label syntax is incorrect en /common/entrance.exe

The application was developed in Delphi using relative paths:

HTMLFile = '..\pages\entrance.htm'

The resulting absolute path would be ok if it wasn't for the strange \\?\ prefix. Running the cgi from console works fine, suggesting something is missing in our configuration. Some advice or direction to look forward to?

Thanks in advance...

Héctor