Can't get gnapplet to install on Nokia 6680

[Turlough Downes]

Hi All,
	I'm trying to set a Nokia 6680 up with Fedora Core 4.  I have 
transferred the gnapplet.sis file to the phone using the Nokia PC suite on 
Windows (couldn't figure out any other way to do it).  I can see the 
gnapplet.sis file in the application manager, but when I try to install it 
nothing happens - the phone thinks for a (short) moment and then does not 
install gnapplet.  The details the phone gives me for gnapplet are as 
follows:

Format:  Symbian OS
Name: gnap
Version: 1.00
Type: Application
Size: 27kB
Supplier:  Unknown
Status: Not installed

I presume I'm missing something stupid here, but I can't figure it out. 
Any help would be very much appreciated ...

Thanks,
        Turlough