There is also another way if you just want to create a cab files that copies some stuff, like a Windows Mobile Standard homescreen theme.
Create an *.inf file like this:
[Version]
Signature="$Windows NT$"
CESignature="$Windows CE$"
Provider="IQ AS"
[CEStrings]
Appname="S730 theme"
[CEDevice]
ProcessorType=0
[SourceDisksNames]
1=,Source1,,"Theme"
[SourceDisksFiles]
"IQS730.home.xml"=1
"IQ-grey-L.bmp"=1
"IQ-grey-P.bmp"=1
[CopyFiles1]
"IQS730.home.xml"
"IQ-grey-L.bmp"
"IQ-grey-P.bmp"
[DestinationDirs]
CopyFiles1=0,"\Application Data\Home"
[DefaultInstall]
CopyFiles=CopyFiles1
The drop the .inf file onto "CabwizSP.exe". Voila 
Now, my problem is that I'm sending this cab file out with a Device Management solution, and I don't just want to automatically install the cab silently on a users smartphone (that bit is easy), but I also want to set this theme as active.
Anyone got any clues on how to do that? On Professional devices there is a registry key you can edit, but I can't seem to find anything similar on the Standard phones.