Cannot Find SQLCE 3.5 Database

hi,
I am developing a PDA project using Windows CE 6.0
I develop an Application using VS 2008 and create a database using SQLCE 3.5 in VS2008.
I run the Application in Mobile 6 Emulator, it is correctly.

When I integrate it in My Custom OS, there is an error to connect the SQLCE 3.5 Database.

My CE 6.0 customed OS included: All 'File System and Data Store' Components.
I also Include the 7 DLL: in C:Program FilesMicrosoft SQL Server Compact EditionV3.5Deviceswce500armv4i
-sqlcecompact35.dll
-sqlceme35.dll
-sqlceqp35.dll
-sqlceca35.dll
-sqlceer35EN.dll
-sqlceoledb35.dll
-sqlcese35.dll

Also, I include the three CAB Files:
- sqlce.dev.ENU.wce5.armv4i.CAB
- sqlce.wce5.armv4i.CAB
- sqlce.repl.wce5.armv4i.CAB


I first Run the three CAB files in My PDA Emulator.
Then I run the Application located: Windows
All the files I imported in my OS is located in Windows

When I run my Application, there is an error prompted:
"The Database file cannot be found. Check the Path to the database.
[Data Source = WindowsTest.sdf]"

I try to use The Query Analyer to open the DB:WindowsTest.sdf,
The Error Message shown:
Error: 0x8004005 E_FAIL
Native Error: (25046)
Interface definning error: IID_IDBInitialize
Param 0 : 0
Param 1 : 0
Param 2 : 0
Param 3 : WindowsTest.sdf

I, then, create a database in my PDA Emulator using isqlw35.exe (Query Analyzer)
and located in WindowsTest2.sdf.
After create the Test2.sdf, I use the Query Analyzer to re-open it. It is correct with no error!
I use my Application to open the WindowsTest2.sdf, and it is correctly too!

Therefore, the problem would be: The SQLCE 3.5 database I created in VS2008, named 'Test.sdf'
cannot be opened in my customed ce 6.0 OS. However the database I created in my customed OS 6.0
emulator ,named 'Test2.sdf' works fine.

Is there any difference or what's wrong when I create a SQLCE 3.5 database and integrated in Windows CE 6.0???