what is difference between mcu file & ppm file .In 6600 which is ppm file

PPM (Language Packs)
01=English,German,French,French- S/Africa)
02=English,German,French,(Euro A)ZA
03=English,Arabic,French,(Lebonan/Arabic)
04=English,German,Italian,(Switzerland)
05=English,German,Italian,(Italy)
06=English,German,Turkish,(Ger-Tur)
07=English,German,French,(ALPS)
08=English,Finnish,Swedish,(Scandinavia1)
09=English,Norwegian,Danish,(Scandinavia2)
10=English,Icelandic,Danish,(Iceland)
11=English,Dutch,French,(Benelux 1)
12=English,Hebrew,Arabic,(Hebrew)
13=English,Russian,German,(CIS)
14=English,Estonian,Russian,(Estonia)
15=English,Latvian,Russian,(Latvia)
16=English,Lithuanian,Russian,(Lithuanian)
17=English,Polish,German,(Poland)
18=English,Czech,Slovakian,(CzechSlovakia)
19=English,Hungarian,German,(Hungary)
20=English,Slovenian,Croatian (Croatia/Slovenia)
21=English,Romanian,German,(Romanian)
22=English,Turkish,German,(Turkey)
23=English,Spanish,French,(Spain)
24=English,Portuguese,French,(Portugal)
25=English,Greek,German,(Greece)
26=English,Russian,Ukrainian(Russia/Ukraine)
27=English,Bulagarian,German,(Bulgarian)
28=English,Serbia Latin,German(Serbia)
30=Brasil
34=English,Philipinnes [APAC2/Philippines]
35=English,Bahasa Mal,Bahasa Indo,[APAC3]
41=AUSTRALIA,NEW ZEALAND
42=English APAC Singapore
43=OPTIMUS,PORTUGAL
44=T-MOBILE UK
45=English
46=WESTEL
47=TELIA,SWEEDEN
48=TDC,DENMARK
49=English,Bahasa Mal,Bahasa Ind,
50=English,
51=PANNON
52=VODAFONE LIVE! D2
53=VODAFONE LIVE! NL
54=VODAFONE LIVE! ITALY
55=VODAFONE LIFE! GREECE
56=VODAFONE LIFE! SWEDEN
57=TELENOR,NORWAY
58=T-MOBILE D,GERMANY
59=English,O2 Genion
60=TIM,ITALY
61=T-MOBILE CZ
62=EUROTEL
63=ERA,PORLAND
64=POLKOMTEL,POLAND
65=O2,UK
66=T-MOBILE AUSTRIA
67=TMN,[Blue] PORTUGAL
68=VODAFONE LIVE! SPAIN
69=VODAFONE LIVE! UK
70=HONG KONG English
71=PROXIMUS
72=VODAFONE LIVE! PORTUGAL
73=E-PLUS,GERMANY
74=DEBITEL GERMANY
75=ORANGE,FRANCE
76=Movistar,English,
77=VODAFONE LIVE! IRELAND
78=T-MOBILE NL
80=SONOFON,DENMARK
81=VODAFONE LIVE! HUNGARY
82=WIND,
83=Finland Counry Variant [GREY][BLUE][YELLOW]
84=CENTERTEL,POLAND
85=SFR,BLEU
87=MOBILKOM,AUSTRIA
88=VODAFONE AU,NZ
89=BOUYGUES,FRANCE
99=English
99=German
99=French
A0=AMENA
A1=COSMOTE
A2=CONNECT,AUSTRIA
A3=O2,IRELAND
A4=PORTAL OPTIMUS
A5=ORANGE,DK
A6=VODACOM SOUTH AFRICA
A7=KPN Mobile NL
A8=UK COUNTRY VARIANT
A9=ODAFONE,EGYPT

MCU
C1=flash with ppm
C2=Trad. Chinese (Taiwan)
C3=Trad Chinese (HONG KONG)
C4=Simpl. Chinese (CHINA PRC)
C6=Simpl. Chinese (China DTT)
C7=Simpl Chinese (CHINA)
C8=Trad. Chinese (Hong Kong)
C9=Trad. Chinese(TAIWAN)

Thanks vvvvvvmuch