I can't make CNR run in Linux, when I launch the game I get the following error
"unable to open file (null) in FILE/FASTFLEX.EXE, in line 38"

This is my dosbox conf file


[sdl]

fullscreen=false
fulldouble=false
fullresolution=original
windowresolution=800x600
output=Overlay
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper.txt
usescancodes=true
aspect=false

[dosbox]

language=
machine=svga_s3
captures=capture
memsize=32

[render]

frameskip=0
aspect=true
scaler=advinterp3x

[cpu]

core=auto
cputype=auto
cycles=max
cycleup=500
cycledown=20

[mixer]

nosound=false
rate=22050
blocksize=2048
prebuffer=240

[midi]

mpu401=intelligent
mididevice=default
midiconfig=128:0

[sblaster]

type=sb16
base=220
irq=5
dma=1
hdma=5
mixer=true
oplmode=auto
oplrate=22050
oplemu=default

[gus]

gus=false

[speaker]

pcspeaker=true
pcrate=22050
tandy=auto
tandyrate=22050
disney=true

[joystick]

joysticktype=auto
timed=true
autofire=false
swap34=false
buttonwrap=true

[serial]

serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled

[dos]

xms=true
ems=true
umb=true
keyboardlayout=it

[IPX]
Enable=0
Connection=0
ipx=false

[autoexec]
mount C .
imgmount d "game.gog" -t iso -fs iso
c:
cls
CRUSADER.EXE
exit

remove the last 3 commands and check that the imgmount command succeeded.

change the imgmount line to
imgmount d "GAME.GOG" -t iso -fs iso

I've got Crusader No Remorse and No Regret running in Linux Mint 12:
Here's the end of the Dosbox conf for Remorse, noting that you need to substitute the
folder that your Crusader is in or you can copy me by placing all your GOG files in a folder called Crurem in another folder called DOS in your home folder. Just follow this model for Crusader no Regret as well.

No Remorse Dosbox conf (in the game folder):

[autoexec]
imgmount d ~/DOS/Crurem/GAME.GOG -t cdrom
mount C ~/DOS/Crurem
c:
CRUSADER.EXE

If you want to launch the game quickly, use a bash script and call it Crusader:

#!/bin/bash
cd ~/DOS/Crurem
dosbox -conf ~/DOS/Crurem/dosboxCRUSADER.conf -c "exit"