Oracle Forms

I'm trying to figure this out for a while now ....

I would like to run sqlldr on a windows-server via a Host command in a form. I've created a testform with one button and a when-button-pressed trigger containing:

Host('sqlldr.exe db10g/db10g@orcl control=gnis.ctl log=gnis_mich.log data=my_gnis.dat');

When running this form in the application server, nothing happens!?
And when I run the same command in a .bat-file directly, it does run!
Also putting the batch file in the host command doesn't help.

I've tried some different commands.

Which doesn't work:

Host('loaddata_gnis.bat');

Host('C:\Oracle10G\product\10.2.0\db_1\BIN\sqlldr db10g/db10g@orcl control=C:\OracleAS_F\forms\gnis.ctl log=C:\OracleAS_F\forms\gnis_mich.log data=C:\OracleAS_F\forms\my_gnis.dat');

Host('sqlldr.exe>sqlldr.txt');

Examples which work fine within this environment:

Host('C:\Oracle10G\product\10.2.0\db_1\BIN\tnsping.exe>tnsping.txt');

Host('dir>list.txt', no_screen);


Does somebody know how to solve this or how to debug?

Thanks!