Here is my sierra.ini file as found under C:\WINDOWS[Paths]
Print Artist 8.0=C:\Sierra\Print Artist 8.0
[Config]
MachineID={}
SoundBitSupport=16
SoundChannels=2
CDROM=4
CDRomDrives=D
MemKB=65000
[Doctor Brain 3]
Directory=C:\SIERRA\DRBRAIN3
HardDriveSearch=FALSE
CDRomDrive=D:
[Setup]
Presetup=1
Purge=
[Last Test]
Product=The Lost Mind of Dr Brain
WAVE Test Result=Heard
CDRomDetected=TRUE
CDRomTest=Passed
I finished the game and was able to see the ending after it crashed and I went back in.