forms developer 6i or 9i

Hi,

Im new to froms developer...
Whats the extension of forms souce code?
I know its .inp/fmx but i also see .rdf files what are these for?

Thanks a lot

Module "source extension to compiled extension"
Menus: mmb to mmx
Forms: fmb to fmx (sometimes you still see fmt)
Reports: rdf to rep
Libraries: pll to plx

.inp was the suffix for the (very old) Sql*Forms 3 (and 2.3 I think).
Neither Forms 6i or 9i will open them. Forms 4.5 would though.

Thanks,

Its really very hard to learn,configure/set-up this Apps server and
forms/reports developer. Can I use HTMLDB 2.0 instead? Will I
still create a good appls with it?