os9.1/9.2 Folder System - Explained
credits : DJNJ, smarty & others

WARNING :
This guide here is only for hacked phone.
Please use this guide only for learning.
We do not take any responsibility for damage caused if you modify these files/folders. Please make sure u know exactly what u are doing

Inside C:\Private folder there are some sub folders :

\1000295\
DBS_100065FF_Contacts.cdb - Contacts Database
DBS_100069CC_btregistry - Bluetooth device List
DBS_10207216_SWinsLog.db - Instalation log of Softwares

\1000395b\Calendar - Calendar File
\10003A73\Cntmodel.ini - Speed dial Numbers
\1000484b\Mail\ - Mail Folder (SMS)
\101F413C\SIPprofiles.dat - SIP (Session Initiation Protocol) Profiles
\101F4668\UnitConverter.ini - Stored Exchange Rates in the Converter
\101F8530\Cookies - Browser Cookies
\101875a\Startup\ - Startup Files ?
\102072CC\SIMLanguage.dat - Current selected language of the SIM
\20003252\Menuketserver.ini - (This File is in the Startup List)
\10003A3F\import\apps\ - All your shortcuts to installed applications are saved in here in .RSC format, simply rename the .RSC to .RSCX to temporarily remove them from Menu, you can rename .RSCX back to .RSC later on.
\101f401d\Logdbu.dat is the log file.
\101F4CD2\Applications.dat is the file that holds the settings and locations of icons and custom folders located on your phone's MENU.

C:\resource\apps - The MIF files (Icon Files) Of the Softwares Installed in the phone,

C:\sys\data\mmcstore - This file has the Memory Card Password, Open with a text editor to view the current memory card password.

Some interesting facts. not yet tested on all phone but please test yours and let me know the result here.

1. C:\private\10000850\
contains the mbm file of operator logos

2. C:\private\100059c9\start.dat
some kind of autorun trigger. I couldnt decode this file, but it is it, I'm sure.. Why I think so? Because only after renaming or moving this file, autorun doesnt work. In all other cases apps start.

3. C:\private\10202be9\20001079.txt
this location.. in this text file there is code, and a line which says :
Code:
0x00040006 string "clockspeed" 0
0x00040007 int 332 0
on line 41 and 42 of the file.. overclocking possibility maybe?

also in this file is loads of settings with the graphics processor too, maybe even OC this check it out, im not the experianced when it comes to this, and i do have a spare n95 which i wouldnt care if it blows up, i willing to test it
Code:
0x00A00000 string "/hardware/graphics/displays/0/ngageorientations" 0
0x00A00001 int 0x00090000 0
0x00A00002 string "ngageorientationscount" 0
0x00A00003 int 3 0
0x00A00004 string "defaultngageorientation" 0
0x00A00005 int 0x08 0
0x00A00006 string "useroptions" 0
0x00A00007 int 0x0B 0
0x00A00008 string "wsinimodes" 0
0x00A00009 string "0x01, 0x02, 0x08" 0
ngage stuff there

Code:
0x00090000 string "/hardware/graphics/displays/0" 0
0x00090001 int 0x00080000 0
0x00090002 string "nativewidth" 0
0x00090003 int 240 0
0x00090004 string "nativeheight" 0
0x00090005 int 320 0
0x00090006 string "pixelsperinchx" 0
0x00090007 int 154 0
0x00090008 string "pixelsperinchy" 0
0x00090009 int 154 0
0x0009000A string "nativecolorformats" 0
0x0009000B int 0x00050000 0
0x0009000C string "brightnessadjustable" 0
0x0009000D int 0 0
0x0009000E string "contrastadjustable" 0
0x0009000F int 0 0
0x00090010 string "gammaadjustable" 0
0x00090011 int 0 0
graphics settings there..

4. In Z/private/101f51f2/PKI/96b7db19a4d...../
it has files in called
Code:
devicecert.der
deviceprivatekey.der
signningcert00.der
signningcert01.der
or in Z/private/10203636/security/trustroots/device/certificates/
nokia content signing
Code:
nokiaonlineca.cer
PCA3ss_v4.der
thawtepremium.cer
UTI_Root.der
click on any of them it says save certificate.
then when you click save it says new cert might be unsecure save anyway? i ant got round to clicking save yet

5. C:\PRIVATE\101F4CD2\Content\appshelldata.xml
this file contains the whole menu layout (N82)

6. I found some huge file in phone, c:/private/102072c4/reserved.bin, 4.5 Mb size of plain 0xff.
Deleted it and free up phone memory check if your phone has one.
the files are for FOTA (firmware over the air) coz when i remove it, and go to the device mgr. app it reapears, so its safe to remove it, we wont need it as we never get any FOTA updates.

Excellent info. BTW, I want to add a bit of info to it.
C:\Private\10005A3E\mediaplayer.dat - This is list of Recent clips in Real Player. Those who want to hide what videos they have seen, can just delete it
And for OS9.1 phones (in my N73-1), some of the folders are different. For example, the
C:\Private\100012a5\DBS_100065FF_Contacts.cdb - Contacts Database
C:\Private\100012a5\DBS_100069CC_btregistry - Bluetooth device List
C:\Private\100012a5\DBS_10207216_SWinsLog.db - Instalation log of Softwares
C:\Private\10003a5b\Calendar - Calendar File
Hope this helps someone.