Lighttpd

Hi
I've been reading the forums and many websites about how to convert form .htaccess to lighttpd.

I've have a CGI program running on Apache on Windows and I am migrating it to Lighttpd.
The version of Lighttpd is

LightTPD/1.4.32-1-IPv6 (Win32) - with SSL Support
   A fast, secure and flexible webserver...

This version is built by WLMP Project, http://en.wlmp-project.net/
   The package is compiled with GCC v4.5.3 under 'i686-pc-cygwin' platform.
   Build-Date: Mar  1 2013 02:12:28

Here is my .htaccess file

RewriteEngine on
  RewriteBase /
  RewriteRule ^$ app.exe [L]
  RewriteCond  !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_URI} !app.exe
  RewriteRule ^(.*)$ app.exe/$1 
  RewriteRule .* - [E=HTTP_AUTHORIZATION:{HTTP:Authorization},L]

And this is what I generated based on the documentation

url.rewrite-once += (
"^.*\.(ico|exe)" => "$0",
"^/(.*)$" => "app.exe/$1"
)

and this is my CGI + document root configuration

document-root ="/htdocs"

cgi.assign = ( ".exe" => "C:/tmp/projects/app.exe" )

But when I ran it I got the following answer

htdocs/app.exe/api/message/time/now HTTP/1.1 404 Not Found

Thanks
Javier