setting bpatcher file with js

I modified the following line from the js tutorial, based on information in the forums:

thesliders[k] = this.patcher.newdefault(k*64,384,"bpatcher",
"@presentation",1,
"@presentation_rect",k*64,384,
"@mode", 1,
"@varname", theName);

Wow, it works!!! And separate scripting names for each item!

But I cannot find info on the syntax for setting the file inside the bpatcher. Anybody know what that is??? I tried @patcher_file and @file, and neither works.

Thanks,
-e