请问这个cue文件是什么意思

请问这个cue文件是什么意思
REM GENRE Grunge
REM DATE 1993
REM DISCID B1102F0C
REM COMMENT "ExactAudioCopy v0.99pb4"
PERFORMER "Nirvana"
TITLE "In Utero"
FILE "01 - Serve The Servants.flac" WAVE
TRACK 01 AUDIO
TITLE "Serve The Servants"
PERFORMER "Nirvana"
PREGAP 00:00:32
INDEX 01 00:00:00
TRACK 02 AUDIO
TITLE "Scentless Apprentice"
PERFORMER "Nirvana"
INDEX 00 03:34:55
FILE "02 - Scentless Apprentice.flac" WAVE
INDEX 01 00:00:00
TRACK 03 AUDIO
TITLE "Heart-Shaped Box"
PERFORMER "Nirvana"
INDEX 00 03:47:15
FILE "03 - Heart-Shaped Box.flac" WAVE
INDEX 01 00:00:00
TRACK 04 AUDIO
TITLE "Rape Me"
PERFORMER "Nirvana"
INDEX 00 04:38:70
FILE "04 - Rape Me.flac" WAVE
INDEX 01 00:00:00
FILE "05 - Frances Farmer Will Have Her Revenge On Seattle.flac" WAVE
TRACK 05 AUDIO
TITLE "Frances Farmer Will Have Her Revenge On Seattle"
PERFORMER "Nirvana"
INDEX 01 00:00:00
FILE "06 - Dumb.flac" WAVE
TRACK 06 AUDIO
TITLE "Dumb"
PERFORMER "Nirvana"
INDEX 01 00:00:00
TRACK 07 AUDIO
TITLE "Very Ape"
PERFORMER "Nirvana"
INDEX 00 02:29:53
FILE "07 - Very Ape.flac" WAVE
INDEX 01 00:00:00
TRACK 08 AUDIO
TITLE "Milk It"
PERFORMER "Nirvana"
INDEX 00 01:54:60
FILE "08 - Milk It.flac" WAVE
INDEX 01 00:00:00
TRACK 09 AUDIO
TITLE "Pennyroyal Tea"
PERFORMER "Nirvana"
INDEX 00 03:53:13
FILE "09 - Pennyroyal Tea.flac" WAVE
INDEX 01 00:00:00
TRACK 10 AUDIO
TITLE "Radio Friendly Unit Shifter"
PERFORMER "Nirvana"
INDEX 00 03:36:22
FILE "10 - Radio Friendly Unit Shifter.flac" WAVE
INDEX 01 00:00:00
TRACK 11 AUDIO
TITLE "tourette's"
PERFORMER "Nirvana"
INDEX 00 04:49:50
FILE "11 - tourette's.flac" WAVE
INDEX 01 00:00:00
TRACK 12 AUDIO
TITLE "All Apologies"
PERFORMER "Nirvana"
INDEX 00 01:33:10
FILE "12 - All Apologies.flac" WAVE
INDEX 01 00:00:00
为什么file和track的写法和一般的不太相同