Windows XP iso image?

It's basically a (mirror) image of a CD usually created using CD burning software such as Nero while doing CD backups / burning.

For example if you wanted to back up a CD you would create an 'image' of that CD (which is all the files in one file) and then burn that image to a new CD thus creating a new cd with your backed up data / music etc.
 
In addition to the data files that are contained in the ISO image, it also contains all the filesystem metadata (boot code, structures, and attributes). All of this information is contained in a single file.

These properties make it an attractive alternative to physical media for the distribution of software which requires this additional information as it is simple to retrieve over the net.

Some of the common uses include the distribution of operating systems, such as Linux or BSD systems, and LiveCDs

:)
 
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