How cot create and read files in ALLUSERSPROFILE directory

Hi,
I have a program that is to be used both with Windows XP, Vista, 7 and 8. It should create and read a file in ALLUSERSPROFILE, which I have learned to be different directories in XP and the other Windows versions. But after looking all over internet, I can't
find any clear answer how to do this. I thought the following should work, but it doesn't:
testfile = fopen("%ALLUSERSPROFILE%/testfile.dat", "r");
Although the file exist, testfile gets the value of zero. I've also tried other strings instead of "ALLUSERSPROFILE," but no luck. Could anyone tell me how to do this?
Thanks in advance.

I tried the following:
     SHGetKnownFolderPath( &FOLDERID_ProgramData, 0, 0, &userpath);
Then the program compiled. But it did not work:
     fopen("%userpath%\\Testfolder\\Testfile.ini", "r");
did not open the file, although it is there.
Then I read that this function can't be used with Windows XP, so I
switched to the deprecated SHGetFolderPath
    TCHAR userpath[MAX_PATH];
     SHGetFolderPath(0, CSIDL_COMMON_APPDATA, 0, SHGFP_TYPE_CURRENT, userpath);
According to the MSDN pages, one then could use the
    PathAppend (userpath, TEXT("Testfolder/Testfile.ini"));
I then added Shlwapi.h and compiled and got the following error message
     main.obj : error LNK2001: unresolved external symbol __imp__PathAppendW@8
     fatal error LNK1120: 1 unresolved externals
Then I again tried
   fopen("%userpath%\\Testfolder\\Testfile.ini", "r");
but neither did this work. So now I don’t know what to do.

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