hi,
the file for pdmweb.exe is NX_ROOT\bopcfg\www\web.cfg. to make your changes persistent, change NX_ROOT/samples/pdmconf/web.cfg.tpl, too. pdmweb1.exe's file should be something like pdmweb1_web.cfg (you can have a look into cfg files, there you can see in the first couple of lines the used CGI for this specific cfg file).
find the line with "freeaccess.spl" at the end and add your filename blank seperated (have a look into well working web.cfg's correspondending line). do the same for the line with "op_table.cfg".
restart webengine
regards
marc