>The UPS API sends the label to be printed in a SPL format. So, at first, I thought what is that. So, I looked over the net and found very little information about it. There is one person who recommended to install an SPL viewer:
>
>http://www.stevenrosson.com/print-export-spl-file
>
>But, this is really not what I want.
>
>Basically, the UPS API sends me a XML which contains a base64 SPL content. I can save that to disk such as a.spl. But, what's next?
>
>Anyone has played with that format before and would recommend the best approach to automate that so I can view it in the browser and then print it?

There are links to many tools at the bottom of this document
http://www.undocprint.org/formats/winspool/spl

Here it says Adobe Flash 15 can open an SPL file.

http://fileinfo.com/extension/spl

But I believe than an SPL file only contains par of the information for the image.