Go4Expert - Ascii characters on windows XP

Hi
I have an application which can be installed on English, French, Japanese and German OS.
I have to identify non-Ascii characters in installation path. If installation path contains non-Ascii characters then application cannot be installed in that path. The problem is I have written a code which identifies if installation path contains non-Ascii characters.

Code:

LONG WINAPI CheckInstallDir4Unicode(MSIHANDLE hMsi)

{



        TCHAR szInstallDir[MAX_PATH];

        DWORD dwSize = MAX_PATH;

        

        

        // Get Installation directory STRING from msi

        MsiGetProperty(hMsi, _T("INSTALLDIR"),szInstallDir, &dwSize);



                

        //check for each character if it is ASCII.

        UINT i,val;

        







        for(i=0; szInstallDir[i];  i++)

        { 

                

                val = (unsigned int )szInstallDir[i]; // ascii value of character at position i

                

                if(val <0 || val >127)   // CHECKING FOR ASCII VAL.

                {

                        

                        // POP A MESG THAT INSTALLATION PATH  CONTAINS

                        // NON-ASCII CHARACTER  AND BREAK

                        break;

                        

                }

                

        }

        

        return 1;





}

I test this code by giving non-Ascii characters in the installation path
such as: 奉孬艳昼臻哥棘

the code unicode checking code works fine when I run it on japanese XP VMware. but it does not work when I run this code on English xp VMware. I want the code should run in all platforms similarly. I dont know what I am missing in this code.