I was not precise enough in my previous post. I can mount the image but when I start the installer I get this message (with the latest version of DTL):
"Original disc could not be found or authenticated."
I'm running Windows XP SP3.
I don't know exactly the properties of the image file (dated July 2008) and don't know how to check them unless you tell me

I can send you the mds file coz it's small

I only know that it was prepared with Alcohol v1.9.7 and in order to run it one should check RPMS emulation in DTL options.
Correction, apparently it's not needed to check anything (as you stated), I've just checked it by running the setup again (mounting with DTL v4.30.4).
That's all...
Best regards,
gr