On Linux, Myst III - music player expects a folder named either M3Data or M3DATA with its content having the following casing:

COMM/ COMMshuttersound
COMM_BadClick
COMM_PageTurn
COMM_SqueeChirp.wav
COMM_Transport
ENCH/ ENCHamb_Wind
ENCHstg_MetalicMoan.wav
ENCHstg_MetalicRumble1.wav
ENCHstg_MetalicRumble2.wav
ENCHstg_RockingMetal1.wav
ENCHstg_RockingMetal2.wav
ENCHstg_RockingMetal3.wav
ENCHstg_scurry1.wav
ENDD/ ENDDamb_SteamLoop
ENDDsfx_Lever
ENDDsfx_LeverFail
ENDDsfx_TriggerClose
ENDDsfx_TriggerOpen
ENDDsfx_VentClose
ENDDsfx_VentOpen
ENEM/ ENEMamb_Electricity
ENEMsfx_ImagerButton
ENEM_AmbientLoop1
ENEM_AmbientLoop2
ENEM_CircuitButton
ENEM_CircuitTurn1
ENEM_CircuitTurn2
ENLC/ ENLCamb_Fan
ENLCamb_Lava
ENLCsfx_DoorClose2short
ENLCsfx_LeverMoveLg
ENLCsfx_LeverMoveMd
ENLCsfx_LeverMoveSm
ENLCsfx_MoveGearLeft2
ENLCsfx_N03DoorClose
ENLCsfx_N15HatchClose2
ENLCsfx_RtGearCW2
ENLI/ ENLIamb_Levitation
ENLIsfx_BookCabinetLocked
ENPP/ ENPPamb_TurbineInside
ENPPamb_TurbineOutside
ENPPamb_Waterfall
ENPPamb_WaterfallInside
ENPPamb_WheelLoopInside
ENPPamb_WheelLoopOutside
ENPPsfx_DoorLocked
ENPPsfx_DripAmbient
ENPPsfx_GearDisengage
ENPPsfx_GearEngage
ENPPsfx_GearGrind
ENPPsfx_LowerDoorClose
ENPPsfx_LowerDoorOpen
ENPPsfx_UpperDoorClose
ENPPsfx_WheelLeverA
ENPPsfx_WheelLeverB
ENSI/ ENSIamb_CaveWater
ENSIamb_CaveWind
ENSIsfx_LBHolderClose
ENSI_LinkingBookClose
ENSI_LinkingBookOpen
EN_M/ EN_M1_bowl1
EN_M1_bowl2
EN_M1_mandolin1.mp3
EN_M1_mandolin2.mp3
EN_M1_mldy1.mp3
EN_M1_mldy2.mp3
EN_M1_mldy3.mp3
EN_M1_mldy4.mp3
EN_M1_mldyB1.mp3
EN_M1_mldyB2.mp3
EN_M1_mldyB3.mp3
EN_M1_mldyB4.mp3
EN_M1_pad
EN_M1_rhythm1
EN_M1_thud1
EN_M1_thud2
EN_M2_mldy1.mp3
EN_M2_mldy2.mp3
EN_M2_mldy3.mp3
EN_M2_mldy4.mp3
EN_M2_mldyB1.mp3
EN_M2_mldyB2.mp3
EN_M2_mldyB3.mp3
EN_M2_mldyB4.mp3
EN_M2_mldyB5.mp3
EN_M2_mldyB6.mp3
EN_M2_mldyC1.mp3
EN_M2_mldyC2.mp3
EN_M2_pad1.wav
EN_M2_pad2.wav
EN_M2_stinger1.mp3
EN_M2_stinger2.mp3
EN_M2_stinger3.mp3
EN_M2_stinger4.mp3
EN_M2_stinger5.mp3
EN_M2_stinger6.mp3
EN_M2_stinger7.mp3
EN_M2_thud1
EN_M2_thud2
EN_M2_thud3
EN_M2_thud4
EN_M3_hits1.mp3
EN_M3_hits2.mp3
EN_M3_hits3.mp3
EN_M3_loop
EN_M3_mharp1.mp3
EN_M3_mharp2.mp3
EN_M3_mharp3.mp3
EN_M3_mharp4.mp3
EN_M3_mldy1.mp3
EN_M3_mldy2.mp3
EN_M3_mldy3.mp3
EN_M3_mldy4.mp3
EN_M3_mldy5.mp3
EN_M3_noise1
EN_M3_noise2
EN_M3_noise3
EN_M3_noise4
EN_M3_pad
EN_M3_stinger1.mp3
EN_M3_stinger2.mp3
EN_M3_stinger3.mp3
EN_M3_stinger4.mp3
EN_M3_stinger5.mp3
EN_M3_stinger6.mp3
EN_M3_stinger7.mp3
EN_M3_stinger8.mp3
EN_T/ EN_THEME_full.mp3
EN_THEME_ghost1.mp3
EN_THEME_ghost2.mp3
EN_THEME_ghost3.mp3
EN_THEME_ghost4.mp3
EN_THEME_ghost5.mp3
EN_THEME_ghost6.mp3
EN_THEME_mldy1
EN_THEME_mldy2
EN_THEME_mldy3
EN_THEME_mldyB1
EN_THEME_mldyB2
EN_THEME_mldyB3
EN_THEME_mldyB4
EN_THEME_pad.mp3
EN_THEME_stinger2
EN_THEME_stinger3
EN_THEME_thud1
EN_THEME_thud2
HOLO/ HOLO_B1.mp3
HOLO_B2.mp3
HOLO_B3.mp3
HOLO_D1.mp3
HOLO_D2.mp3
LEIS/ LEISamb_Lagoon1
LEISamb_Ocean1
LEISamb_WhistlingRock
LEISamb_Wind1
LEISamb_Wind2
LEISsfx_BMossRetract
LEISsfx_Bridge
LEISsfx_DoorButton
LEISsfx_DoorUnlock
LEISsfx_LightGun
LEISsfx_LightGunWheel
LEISsfx_LightRefa
LEISsfx_LightRefb
LEISsfx_LightRefc
LEISsfx_SqueeChirps
LEIS_MUSIC_16ths
LEIS_MUSIC_54rhythm
LEIS_MUSIC_am.mp3
LEIS_MUSIC_am2.mp3
LEIS_MUSIC_bass
LEIS_MUSIC_ed.mp3
LEIS_MUSIC_ed2.mp3
LEIS_MUSIC_harp1.mp3
LEIS_MUSIC_harp2.mp3
LEIS_MUSIC_jn.mp3
LEIS_MUSIC_na.mp3
LEIS_MUSIC_pad2
LEIS_MUSIC_pipe1.mp3
LEIS_MUSIC_pipe2.mp3
LEIS_MUSIC_pipe3.mp3
LEIS_MUSIC_pipe4.mp3
LEIS_MUSIC_pipe5.mp3
LEIS_MUSIC_pipe6.mp3
LEIS_MUSIC_pizz1.mp3
LEIS_MUSIC_pizz2.mp3
LEIS_MUSIC_pizz3.mp3
LEIS_MUSIC_sheet1.mp3
LEIS_MUSIC_sheet2.mp3
LEIS_MUSIC_sheet3.mp3
LEIS_MUSIC_sheet4.mp3
LEIS_MUSIC_sheet5.mp3
LEIS_MUSIC_strings1.mp3
LEIS_MUSIC_strings2.mp3
LEIS_MUSIC_strings3.mp3
LEIS_MUSIC_to.mp3
LEIS_MUSIC_to2.mp3
LEIS_MUSIC_vona.mp3
LEIS_SAAV1.mp3
LEIS_SAAV1_stng1
LEIS_SAAV1_stng2
LEIS_SAAV1_stng3
LEIS_SAAV2_hrtbt
LEIS_SAAV2_pad
LEIS_SAAV2_stng1
LEIS_SAAV2_stng2
LEIS_SAAV2_stng3
LEIS_SAAV2_stng4
LEIS_SAAV2_stng5
LEIS_SAAV2_stng6
LEIS_SAAV2_stng7
LEIS_SAAV2_vox1.mp3
LEIS_SAAV2_vox2.mp3
LEIS_SAAV2_vox3.mp3
LEIS_SAAV2_vox4.mp3
LEIS_SAAV2_wf1
LEIS_SAAV2_wf2
LEIS_SAAV2_wf3
LEIS_SAAV2_wf4
LEIS_WINDOW.mp3
LEMT/ LEMTsfx_BridgeAdjust
LEMTsfx_BridgeControl1
LEMTsfx_BridgeControl2
LEMTsfx_BridgeControl3
LEMTsfx_BridgeControl4
LEMTsfx_KegRoll
LEMTsfx_KegRollandHit
LEMTsfx_KegRollFall
LEOF/ LEOFsfx_Dangler1
LEOFsfx_Dangler1Short
LEOFsfx_Dangler2
LEOFsfx_Dangler2Short
LEOFsfx_Dangler3
LEOFsfx_Dangler3Short
LEOFsfx_DoorClose
LEOFsfx_ElevCntrlZmBigA
LEOFsfx_ElevCntrlZmSmlA
LEOFsfx_ElevPitSwitch1
LEOFsfx_ElevPitSwitch2
LEOFsfx_FlyLoop
LEOFsfx_PitGearL
LEOFsfx_PitGearR
LEOFsfx_TriSwitch
LEOFsfx_TriSwitchFlip
LEOFsfx_Unlock
LEOF_OS_MUSIC_drum1
LEOF_OS_MUSIC_drum2
LEOF_OS_MUSIC_drum3
LEOF_OS_MUSIC_logs
LEOF_OS_MUSIC_pad.mp3
LEOF_OS_MUSIC_perc1
LEOF_OS_MUSIC_perc2
LEOF_OS_MUSIC_perc3
LEOF_OS_MUSIC_perc4
LEOF_OS_MUSIC_perc5
LEOF_OS_MUSIC_pizz1
LEOF_OS_MUSIC_pizz2
LEOF_OS_MUSIC_zither1
LEOF_OS_MUSIC_zither2
LEOF_OS_MUSIC_zither3
LEOF_SAAV_drum1
LEOF_SAAV_drum2
LEOF_SAAV_drum3
LEOF_SAAV_mldy1.mp3
LEOF_SAAV_mldy2.mp3
LEOF_SAAV_mldy3.mp3
LEOF_SAAV_pad
LEOF_SAAV_rhythm
LEOF_SAAV_tonal.mp3
LEOS/ LEOSsfx_BridgeOpenST
LEOSsfx_CageOpenST
LEOSsfx_CageRiseST
LEOSsfx_CloseNarayanBookM
LEOSsfx_CloseObsDoorWalkAwyST
LEOSsfx_DoorHandleLocked
LEOSsfx_DoorLockST
LEOSsfx_DoorUnlockST
LEOSsfx_ElevCallSwitchM
LEOSsfx_ElevCallSwitchST
LEOSsfx_ElevLowerOutsideNoDoor
LEOSsfx_ElevRiseOutsideNoDoor
LEOSsfx_ImagerSwitchM
LEOSsfx_ImagerSwitchST
LEOSsfx_LightTableST
LEOSsfx_OpenElevDoorST
LEOSsfx_OpenIntElevDrAwayST
LEOSsfx_OpenNarayanBook
LEOSsfx_TelescopeClick
LEOSsfx_TelescopeOpenST
LEOSsfx_TelescopeZoom1
LEOSsfx_TelescopeZoom2
LEOS_SCENE_5_2.mp3
LIDR/ LIDRamb_BabyCriesNew
LIDRsfx_BirdHappySkwawk
LIDRsfx_BirdSadSkwawk
LIDRsfx_BulbBurnLoop
LIDRsfx_BurnLensClose
LIDRstg_TreeCreek1
LIDRstg_TreeCreek2
LIDRstg_TreeCreek3
LIDR_Ambient
LIFO/ LIFO_Ambient
LIFO_BirdTrapLoop.wav
LIFO_WindAmbient
LISP/ LISPamb_Swamp.wav
LISPamb_SwampIn.wav
LISPamb_WaterLapping
LISP_FFOpen
LISP_MothLoop
LISW/ LISWamb_FishLoop
LISWamb_FishShock
LISWsfx_25VineDrop.wav
LISWsfx_CageHandle.wav
LISWsfx_FruitRollCage
LISWsfx_FruitRollSafe
LISWsfx_SqueeLoopM
LISWsfx_SqueeRunoff.wav
LISWsfx_SqueeToFruitA
LISWsfx_SqueeToFruitB
LISWsfx_SqueeTrapped
LISW_Ambient
LISW_BirdTrapped.wav
LISW_SqueeTrappedLoop
LI_M/ LI_M1_gtr1
LI_M1_gtr2
LI_M1_gtr3
LI_M1_mldy1.mp3
LI_M1_mldy2.mp3
LI_M1_mldy3.mp3
LI_M1_mldy4.mp3
LI_M1_ostinato.mp3
LI_M1_pad1
LI_M1_perc1
LI_M1_perc2
LI_M1_perc3
LI_M1_perc4
LI_M1_perc5
LI_M1_stinger1
LI_M1_stinger2
LI_M1_stinger3
LI_M2_drum1
LI_M2_drum2
LI_M2_loop
LI_M2_mldy1.mp3
LI_M2_mldy2.mp3
LI_M2_mldy3.mp3
LI_M2_pad.wav
LI_M2_sfx1
LI_M2_sfx2
LI_M2_sfx3
LI_M2_stinger1
LI_M2_stinger2
LI_M2_stinger3
LI_M2_stinger4
LI_M3_bells1
LI_M3_bells2
LI_M3_bells3
LI_M3_pad
LI_M3_pipe1.mp3
LI_M3_pipe10.mp3
LI_M3_pipe2.mp3
LI_M3_pipe3.mp3
LI_M3_pipe4.mp3
LI_M3_pipe5.mp3
LI_M3_pipe6.mp3
LI_M3_pipe7.mp3
LI_M3_pipe8.mp3
LI_M3_pipe9.mp3
LI_M3_stinger1.mp3
LI_M3_stinger2.mp3
LI_M3_stinger3.mp3
LI_T/ LI_THEME_C.mp3
LI_THEME_ghost1.mp3
LI_THEME_ghost2.mp3
LI_THEME_ghost3.mp3
LI_THEME_ghost4.mp3
LI_THEME_ghostvox1.mp3
LI_THEME_ghostvox2.mp3
LI_THEME_mldy1.mp3
LI_THEME_mldy2.mp3
LI_THEME_mldy3.mp3
LI_THEME_mldy4.mp3
LI_THEME_mldy5.mp3
LI_THEME_mldy6.mp3
LI_THEME_mldy7.mp3
LI_THEME_mldyB1.mp3
LI_THEME_mldyB2.mp3
LI_THEME_mldyB3.mp3
LI_THEME_mldyB4.mp3
LI_THEME_pad1
LI_THEME_pad2.wav
LI_THEME_pipe1.mp3
LI_THEME_pipe2.mp3
LI_THEME_rhythm1
LI_THEME_rhythm2
LI_THEME_rhythm2a
LI_THEME_rhythm2b
LI_THEME_rhythm2c
LI_THEME_wail.mp3
LI_THEME_wf1.mp3
LI_THEME_wf2.mp3
LI_THEME_wf3.mp3
LI_THEME_wf4.mp3
LI_THEME_wf5.mp3
LI_THEME_wf6.mp3
LI_THEME_whine.mp3
MACA/ MACAamb_CrystalEnergy
MACAstg_Drip2
MACAstg_Drip4
MACAstg_Drip5
MAIS/ MAISamb_Water
MAISamb_Wind
MAISsfx_BridgeClose.wav
MAISsfx_BridgeOpen.wav
MAISsfx_DoorCloseFromBehind
MAISstg_Thunder1
MAISstg_Thunder2
MALL/ MALLsfx_PlaceCrystal.wav
MALLsfx_PlaceMetal.wav
MALLsfx_PlaceWood.wav
MALL_DoorClose.wav
MALL_Levers.wav
MALL_TroughLower.wav
MALL_WheelMove.wav
MASS/ MASSsfx_CloseupNeedle
MASSsfx_OrbDissipate
MASS_ControlSound1
MASS_ControlSound2
MASS_ControlSound3
MASS_ControlSound4
MASS_ControlSound5
MATO/ MATOsfx_BallLoop
MATOsfx_BallTurn
MATOsfx_Switchyard_BallLoop
MATOsfx_Switchyard_BallTurn
MATO_BridgeDown.wav
MATO_BridgeUp.wav
MATO_ControlCaseClose.wav
MATO_ControlCaseOpen.wav
MATO_IntDoorClose.wav
MATO_RotateInterface.wav
MAWW/ MAWWsfx_BallShootLong
MAWWsfx_BallShootShatter
MAWWsfx_BallShootShort
MAWWsfx_HitWater
MAWWsfx_InsertPeg
MAWWsfx_RotateWheelLoop
MAWWsfx_TakePeg
MAWWsfx_WheelStopPegDrop
MA_M/ MA_M1_hit1
MA_M1_hit2
MA_M1_hit3
MA_M1_hit4
MA_M1_metal1
MA_M1_metal2
MA_M1_metal3
MA_M1_mldy1.mp3
MA_M1_mldy2.mp3
MA_M1_mldy3.mp3
MA_M1_pad.mp3
MA_M1_squeal1
MA_M1_squeal2
MA_M1_squeal3
MA_M1_stinger1
MA_M1_stinger2
MA_M2_belltree1
MA_M2_belltree2
MA_M2_belltree3
MA_M2_mldy1_1.mp3
MA_M2_mldy1_2.mp3
MA_M2_mldy1_3.mp3
MA_M2_mldy1_4.mp3
MA_M2_mldy1_5.mp3
MA_M2_mldy2.mp3
MA_M2_mldy3.mp3
MA_M2_mldy4.mp3
MA_M2_mldy5.mp3
MA_M2_mldy6.mp3
MA_M2_ostinato
MA_M2_pad.mp3
MA_M2_seagull1
MA_M2_seagull2
MA_M2_seagull3
MA_M3_bell
MA_M3_mldy1.mp3
MA_M3_mldy2.mp3
MA_M3_mldy3.mp3
MA_M3_pad1.mp3
MA_M3_pad2.mp3
MA_M3_perc1
MA_M3_perc2
MA_M3_perc3
MA_M3_stinger1
MA_M3_stinger2
MA_M3_stinger3
MA_T/ MA_THEME_bass
MA_THEME_chime1.mp3
MA_THEME_chime2.mp3
MA_THEME_chime3.mp3
MA_THEME_full.mp3
MA_THEME_ghost.mp3
MA_THEME_harp.mp3
MA_THEME_mldy1.mp3
MA_THEME_mldy2.mp3
MA_THEME_mldy3.mp3
MA_THEME_mldy4.mp3
MA_THEME_mldy5.mp3
MA_THEME_mldyB1.mp3
MA_THEME_mldyB2.mp3
MA_THEME_mldyB3.mp3
MA_THEME_mldyC1.mp3
MA_THEME_mldyC2.mp3
MA_THEME_mldyC3.mp3
MA_THEME_ostinato
MA_THEME_pad1
MA_THEME_pad2
MA_THEME_perc1
MA_THEME_perc2
MA_THEME_perc3
MA_THEME_perc4
MA_THEME_perc5
MA_THEME_stinger1.mp3
MA_THEME_stinger2.mp3
MA_THEME_stinger3.mp3
MA_THEME_stinger4.mp3
MA_THEME_stinger5.mp3
NACH/ NACHamb_Generator
NACHamb_IntShieldDown
NACHamb_IntShieldUp
NACHamb_ShieldDown
NACHamb_ShieldUp
NACHScene12_1MusicEnd
NACHsfx_ControlPanelDown
NACHsfx_ControlPanelFail
NA_M/ NA_M1_choir1.mp3
NA_M1_choir2.mp3
NA_M1_hit1
NA_M1_hit2
NA_M1_hit3
NA_M1_hit4
NA_M1_hit5
NA_M1_hit6
NA_M1_mldyA1.mp3
NA_M1_mldyA2.mp3
NA_M1_mldyA3.mp3
NA_M1_mldyB1.mp3
NA_M1_mldyB2.mp3
NA_M1_mldyB3.mp3
NA_M1_mldyC1.mp3
NA_M1_mldyD1.mp3
NA_M1_mldyE1.mp3
NA_M1_orchloop1
NA_M1_orchloop2
NA_M1_orchloop3
NA_M1_pad1
NA_M1_pad2
NA_M1_saavA1.mp3
NA_M1_saavA2.mp3
NA_M1_saavA3.mp3
NA_M1_saavB1.mp3
NA_M1_saavB2.mp3
NA_M1_saavB3.mp3
NA_M1_saavB4.mp3
NA_M1_saavB5.mp3
NA_M1_saavB6.mp3
NA_M1_stinger1.mp3
NA_M1_stinger2.mp3
NA_M1_stinger3.mp3
NA_M1_stinger4.mp3
NA_M1_stinger5.mp3
NA_S/ NA_SCENE10_horngrowl.mp3
NA_SCENE10_hornrip
NA_SCENE10_pad.mp3
NA_SCENE10_perc2.mp3
NA_SCENE10_perc3.mp3
NA_SCENE10_strings
NA_SCENE10_winds1
NA_SCENE12.mp3
TOHB/ TOHB_Endgame_Music.mp3
TOHO/ TOHOamb_FireLoop
TOHOamb_GenericIndoors
TOHOsfx_DoorCloseInside
TOHOsfx_DoorLocked
TOHOsfx_RivenBookClose
TOHOsfx_RivenBookOpen
TOHOstg_Scene03End
TOHO_MUSIC1
TOHO_MUSIC2.mp3