Forget it, i have found this .conf and adapting the autoexec part it works pretty well!

http://www.lemmings.millerpla.net/?page_id=9

Hi, i'm an old gamer who loves the Lemmings franchise. With the 25 christmas i remember the only game i didn´t finish: All new World of Lemmings

I'm triying to run it throught DosBox 0.74, and everitthing is fine: The game starts, the menu go superfast but the puzzle levels go perfectly, even with music and sound effects.

But everytime i finish a level the completed level screen shows with a looping sound and then the game crash without any message

I post here my dosbox conf, i hope you can help me:

[cpu]
core=auto
cputype=auto
cycles=max
cycleup=10
cycledown=20
[mixer]
nosound=false
rate=44100
blocksize=1024
prebuffer=20
[midi]
mpu401=intelligent
mididevice=default
midiconfig=
[sblaster]
sbtype=sb16
sbbase=220
irq=7
dma=1
hdma=5
sbmixer=true
oplmode=auto
oplemu=default
oplrate=44100
[gus]
gus=false
gusrate=44100
gusbase=240
gusirq=5
gusdma=3
ultradir=i:\ULTRASND
[speaker]
pcspeaker=true
pcrate=44100
tandy=auto
tandyrate=44100
disney=true
[joystick]
joysticktype=auto
timed=true
autofire=false
swap34=false
buttonwrap=false
[serial]
serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled
[dos]
xms=true
ems=true
umb=true
keyboardlayout=auto
[ipx]
ipx=false
[autoexec]
cd ..
@cd ..
@mount c .\games\
c:
cls
@cd lemm3
@l3cd
@exit