when other sprint pcs phone share/send a picture to my treo from their phone (which is not a treo) i get a SMS with a link to a web site with the picture, but how can i download the picture?

The download picture link make Blazer popup a unreconized file format. I actaully know that the file format is *.gcd because i used to have a sprintpcs phone. This *.gcd file is just a type of loader for where to download the actual file. Does anyone know how to make a program that can accept these *.gcd files and then download the approiate file(s) (which then could be saved into their appropiate locations)?