Sadly, ExectuabilityCheck is nearly worthless on CE 5.0. While you can still use it to rename dll imports and change the OS version, it doesn't seem able to correctly check for missing exports anymore. It doesn't even work on a more complete CE 5 OS like WM5/WM6...
Your only decent choice for this is sadly depends.exe and perhaps a dump of your device's rom files
(so it can compare the imports with the actual versions on your device
)
SK's peinfo also will list imports but its not quite as easy to read as the PC app depends.exe or ExecutabilityCheck on older OS versions...
http://www.dependencywalker.com/