Burning image file?

Hi there
I have done a search on the Forum but not finding what I need. Anyone able to help. I have a 1.4GB file which is meant to be an image file. When I try burn to DVD it does not find the file. How do I check the format or change the format of the file. Windows XP reads it as image file???
I have Nero and ClondDVD as burning software.

Right click on the file and see what is file extension in file properties.

Anyway, how did you obtained that file? What software did you used to create it?

If the ISO was made with clonecd I believe you have to use that program to burn as well .

Nero 7 or RecordNow Max will burn image files for you no problems.