Mobile use, download's xx.php or xx.bin, not myfile.gpx

[mobile]

I'm trying to do php-code that let me download .gpx files (xml gps-track file) from my server to my phone (N-serie Nokia).

Problem is that other similar script i try, download my xxx.gpx with name "scriptname.php", not xxx.gpx.

This (great on pc) code downloads my file named "content.bin", not xxx.gpx.

Content of the file is fine, just name is wrong! I did try htaccess with different mime types, no help. Anyone know solution for this?