Script to export DWG to NWD path issue

[OCD]

I need help writing a script to export DWG to NWD (NavisWorks). I need to set a path, the NWD is going all over the place when it saves. So far I got:
;prevent dialog box
filedia
0
;nwdout
nwdout

;allow dialog box
filedia
1
;end

I don't know how to predefine the path or add the path to the file name at the prompt (would like to use DWG's path):
Command: nwdout
File name <filename.nwd>:

[OCD]

Anyone got a suggestion?

[RobertB]

It depends on if the ARX command will accept AutoLISP statements:
(strcat (getvar 'DwgPrefix) (vl-filename-base (getvar 'DwgName)))

[OCD]

I couldn't get that to work, I think I am doing it wrong.

I was able to take the text the code generated "C:\\Temp\\Test" and past it at
Command: nwdout -- File name <test.nwd>:C:\\Temp\\Test
and the define path worked. Just need to know a way to take "<test.nwd>" part and added it to the path so it will work as a script for multiple files. I have tried using <>, but that doesn't work.

[RobertB]

If the ".nwd" is required this provides it:
(strcat (getvar 'DwgPrefix) (vl-filename-base (getvar 'DwgName)) ".nwd")

[howardjosh]

Robert was right on the money with that lisp string, but as a side note you could even tell autocad to automatically open the file in navis as well using the "Start" command. How it would work from a script I don't know, but this is how I currently do it in lisp.
(command "start" File_Path_as_String)

an additional bit of info would be that the start command seems to work just like start->run does on windows.... meaning you can open the windows calculator just by typing start and then calc from within autocad