If you were to open up an XCF in winzip, you would see ONLY 2 types of image files. .bmp and .png. The native graphic engine of the pro remotes is .png. Any .jpg files you insert into the editor are converted to 24 bit .bmp files when saving your XCF.

I suspect that the webserver is delivering a 'chunked' http header in the middle of your data, especially if the file is large. The Philips RSS feed example on their website (u can download if you are level 1 certified) deals with chunked headers if you are wanting to have a look at the code.

I could be wrong but and if so, with regard to a bug or not? After investigating whether or not you are dealing with a 'chunked' file, and you still have an issue, why not ask belgium? Send your email to prontoteam at philips dot com and include link to image or attach the one you are having problems with.