Converting .mnu to .lisp - need information about .mnu structure

Hello.

I litterally started learning lisp today by trying convert a script written in lisp inside a .mnu file for Acad R13 into .lsp routine for Acad2000i.

So far I've managed convert it and some functions seems to work, but it doesn't work 100%

I cannot find ANY information about structure of .mnu files, so I need some help with several lines that I don't quiet understand.

So far my understanding is that:

; = represents an ENTER key (or a newline)

+ = next line will continue the command

\ = end of command

But what about:

\+

i.e.

(SETQ PTD (GETPOINT "PICK ENDPOINT OF LOW LEFT CORNER: "));ENDPOINT;\+
(COMMAND "3DPOLY" PTA PTC);;+

or

(SETQ ED (ENTGET (CAR (ENTSEL))));\+
(SETQ PTA (CDR (ASSOC 12 ED)));+

How do I convert them to lisp?

I've attached the original .mnu file and converted .lsp

Thank you.

RULEFLAT.zip

Here is an example

***MENUGROUP=BIGALSTDS

***POP15
**CADLIB
            [LIBRARY]
[->LISP2 C-D]      
      [->CARPARKS]
            [No carparks]^C^C(load "how many carparks") carpark
            [Carpark 0]^C^C(load "simple carpark") npark90
            [Carpark 30]^C^C(load "simple carpark") npark30
            [Carpark 45]^C^C^p(load "simple carpark") npark45
            [Carpark 60]^C^C(load "simple carpark") npark60
            [<-Carpark 90]^C^C(load "simple carpark") npark90
            [Convert CCAD]^c^c(load "civilcad convert")
            [Chain-Off]^C^C^p(LOAD "CHAIN-OFF")
            [<-Dynam Rad]^C^C(LOAD "Continuousfillet1.2") CF             
[->LISP3 E-K]
            [EditLsect]^C^C(LOAD "EditLsect")
. and so on
.
.
[<-]