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Thanks, guys, for all the hints!

Based on your ideas I went one step further and eliminated the need for cmd2exe or similar tools: Simply add a heading 'C:\Programs\Mozilla.org\Seamonkey\;' entry to your PATH variable.

Here is how-to on Win2k (might be slightly different from WinXP):

1) Make sure you know the path to your SeaMonkey program. For instance, use File Explorer's search to find the file 'seamonkey.exe' on your system.
2) Open START/Settings/Control Panel.
4) Double click 'System'.
5) Select the 'Advanced' tab.
6) Click 'Environment Variables'.
7) In the lower half of the windows the system variables are listed. Select the variable 'Path' and click on 'Edit...'.
8) Add the path you found out in 1) to the _BEGINNING_ of the Path variable's content followed by a backslash (\) and a semicolon (;), eg. C:\Programs\Mozilla.org\Seamonkey\;
9) Click 'Ok' three times and you're ready to use SeaMonkey with GoogleEarth!

HIH, Tiger