🚀 go-pugleaf

How can I install a cab file from code?

I'm using a third part activex control in a cppbuilder app. I need to
deploy the activex control on target machines. The author provides me
a cab file (written for internet download) with two files in:
sample.inf
sample.dll

sample.dll must be
1) copied into c:\windows\system32\sample\sample.dll
2) registered

I used the following syntax:
    WinExec("c:/windows/sistem32/rundll32.exe
setupapi,InstallHinfSection DefaultInstall 132
c:/mysetuppath/sample.inf" ..);
and the dll is actually copied to destination but it's not registered.
I think that the problem is in the inf file i.e. I can't use the inf
file outside the cab file. I think I should install the cab file i.e I
can't manually explode the cab and run the inf file. Am I right?

Here is the full sample.inf:

    ; sample ActiveX installation
    [version]
    signature="$CHICAGO$"
    AdvancedINF=2.0

    ;installation information sections
    [DefaultInstall]
    CopyFiles=InstallFilesSection,InstallInfSection
    RegisterOCXs=RegisterOCXSection

    [DefaultUninstall]
    ; cleanup=1 will cause the inf file to be removed
    cleanup=1
    Delfiles=sample.dll
    UnRegisterOCXs=UnRegisterOCXSection

    [RegisterOCXSection]
    %11%\sample\sample.dll

    [UnRegisterOCXSection]
    %11%\sample\sample.dll

    ;files to be copied to the user's machine
    [InstallFilesSection]
    sample.dll=sample.dll

    [InstallInfSection]
    sample.inf=sample.inf

    ;source location for specified platform version
    [sample.dll]
    file-win32-x86=thiscab
    FileVersion=2,0,0,0
    RegisterServer=yes

    ;source location for specified platform version
    [sample.inf]
    file-win32-x86=thiscab
    FileVersion=1,0,0,0

    ;destination directory for files in the CopyFiles section
    [DestinationDirs]
    InstallFilesSection=11,sample ;new folder in windows system drive
(\winnt\system32)
    InstallInfSection=17          ;Windows\Inf folder

I think I have two choices:
1) rewrite the inf file (never done! howto?)
2) install the cab file directly