How to deal with Enter the Matrix 

First of all the problems with Enter the matrix are 
1 the disk is bigger than a DVD-R (so you can not just pop it on a DVD) 
2 the filenames are longer than the box Hard Drive file system will cope with (well some of them) (so you can not just put it on the hard drive) 

How to fix the files so they will work on Hard Drive 

First of all copy all the files from the DVD to your PC Hard Drive (Evox dashboard FTP) 
Next patch the Default.xbe file (make it compatible with the older Xbox Mod Chip BIOSES (X1 etc)) 
ISOCraxtion-v21 patch utility will do the job just fine 

Next find all the files with names longer than the 42 Characters the Xbox Hard Drive can use 
(I FTP'd the files to the Xbox with flashfxp and the ones that did not copy were the ones I was interested in) 

So we have got a list of the Files with names >42 Characters 
Next rename the files to get them <42 
(I used the following KEY) 

\Effects\Beat_2_Airport\ 
particle_B2_AP_03_G_NORTH_POINT_CONCOURSE.txt 
ptexture_B2_AP_03_G_NORTH_POINT_CONCOURSE.txt 
NORTH_POINT_CONCOURSE =N_P_C 

(so particle_B2_AP_03_G_NORTH_POINT_CONCOURSE.txt 
became particle_B2_AP_03_G_ N_P_C.txt, get the Idea) 

Here is the full rest of the list 

particle_B2_AP_03_N_UNDERGROUND_TUNNELS.txt 
ptexture_B2_AP_03_N_UNDERGROUND_TUNNELS.txt 
UNDERGROUND_TUNNELS =U_T 

particle_B2_AP_05_G_REVOLVING_RESTAURANT.txt 
ptexture_B2_AP_05_G_REVOLVING_RESTAURANT.txt 
REVOLVING_RESTAURANT =RE_RE 

particle_B2_SW_01_G_UPPER_MAIN_JUNCTION.txt 
particle_B2_SW_01_N_UPPER_MAIN_JUNCTION.txt 
ptexture_B2_SW_01_G_UPPER_MAIN_JUNCTION.txt 
ptexture_B2_SW_01_N_UPPER_MAIN_JUNCTION.txt 
UPPER_MAIN_JUNCTION =U_M_J 

particle_B2_SW_05_G_DEEP_WATER_JUNCTION2.txt 
particle_B2_SW_05_G_DEEP_WATER_JUNCTION.txt 
particle_B2_SW_05_N_DEEP_WATER_JUNCTION2.txt 
particle_B2_SW_05_N_DEEP_WATER_JUNCTION.txt 
ptexture_B2_SW_05_G_DEEP_WATER_JUNCTION2.txt 
ptexture_B2_SW_05_G_DEEP_WATER_JUNCTION.txt 
ptexture_B2_SW_05_N_DEEP_WATER_JUNCTION2.txt 
ptexture_B2_SW_05_N_DEEP_WATER_JUNCTION.txt 
DEEP_WATER_JUNCTION =D_W_J 

\Effects\Beat_3_Chateau\ 
particle_B3_MC_01_G_GROUND_FLOOR_CENTRAL.txt 
ptexture_B3_MC_01_G_GROUND_FLOOR_CENTRAL.txt 
ptexture_B3_MC_01_N_GROUND_FLOOR_CENTRAL.txt 
particle_B3_MC_01_N_GROUND_FLOOR_CENTRAL.txt 
GROUND_FLOOR_CENTRAL =GR_F_C 

particle_B3_MC_04_G_SECRET_PASSAGE_GHOST.txt 
ptexture_B3_MC_04_G_SECRET_PASSAGE_GHOST.txt 
SECRET_PASSAGE_GHOST =S_P_G 

\Effects\Beat_5_Powerplant\ 
particle_B5_PP_05_G_EXT_CHLOROBROMO_AREA.txt 
particle_B5_PP_05_N_EXT_CHLOROBROMO_AREA.txt 
ptexture_B5_PP_05_G_EXT_CHLOROBROMO_AREA.txt 
ptexture_B5_PP_05_N_EXT_CHLOROBROMO_AREA.txt 
CHLOROBROMO_AREA =C_A 

\Effects\Beat_7_Hovercraft\ 
particle_B7_HC_01_G_HOVERCRAFT_TUNNEL_A.txt 
particle_B7_HC_01_G_HOVERCRAFT_TUNNEL_C.txt 
particle_B7_HC_01_G_HOVERCRAFT_TUNNEL_F.txt 

particle_B7_HC_01_N_HOVERCRAFT_TUNNEL_A.txt 
particle_B7_HC_01_N_HOVERCRAFT_TUNNEL_C.txt 
particle_B7_HC_01_N_HOVERCRAFT_TUNNEL_F.txt 

ptexture_B7_HC_01_G_HOVERCRAFT_TUNNEL_A.txt 
ptexture_B7_HC_01_G_HOVERCRAFT_TUNNEL_C.txt 
ptexture_B7_HC_01_G_HOVERCRAFT_TUNNEL_F.txt 

ptexture_B7_HC_01_N_HOVERCRAFT_TUNNEL_A.txt 
ptexture_B7_HC_01_N_HOVERCRAFT_TUNNEL_C.txt 
ptexture_B7_HC_01_N_HOVERCRAFT_TUNNEL_F.txt 
HOVERCRAFT_TUNNEL =HO_T 

I then used a Hex Editor to Edit the Default.xbe file 
And replaced the part filenames with their cut down versions 
Sliding up the text following the name (until the next 00) and padding the text with 00 

So the 2E 33 64 32 00 (.3d2) etc remained on the end of the text. 
And was careful with the B _A _B etc at the end of some 
keeping the full name as was with the replacement bits. 

(basically BLAHBLAHBLAXXX00 
became BLBLBLXXX00000000000000000000 
with 
BLAH=BL) 

I then FTP'd the game to the Xbox, it plays fine (well at least to the Abyss level where I got bored) 

Hope this helps 

(You still need IGR turned OFF though)