Moved to Off Topic
I have several Palm-size PCs including the E-15, and the only one I've ever successfully connected to the Internet on is the HP Jornada 430SE, which has an SH3 processor.
(The E-15 has a MIPS processor. Programs written for SH3 won't work with a MIPS processor, and vice versa.
)
You'll have better luck with the media player and file explorer, but you'll need to connect the E-15 to a PC with ActiveSync installed to install the programs on the E-15. TCPMP
(The Core Pocket Media Player
) is here in the Software Compatibility List:
http://www.hpcfactor.com/scl/details.asp?id=39&page=download
Download all the files with "setup" in the name and run them on the PC while the E-15 is connected through ActiveSync, and they'll install on the E-15.
There are lots of file explorers, but Total Commander is the best:
http://ghisler.com/wince2x.htm
Again, download the Windows installer
(tcmdwince.exe
) and run it on the PC with an ActiveSync connection to install it on the E-15.