rv = file->Append(appendPath);
rv = file->AppendRelativePath(appendPath);
void CreationTest(char* creationPath, char* appendPath,		  PRInt32 whatToCreate, PRInt32 perm){    nsCOMPtr<nsILocalFile> file;    nsresult rv =     nsComponentManager::CreateInstance(NS_LOCAL_FILE_PROGID,                                               nsnull,                                               NS_GET_IID(nsILocalFile),                                               (void **)getter_AddRefs(file));    if (NS_FAILED(rv) || (!file))     {        printf("create nsILocalFile failed\n");        return;    }    Banner("Creation Test");    printf("creationPath == %s\nappendPath == %s\n", creationPath, appendPath);    rv = file->InitWithPath(creationPath);    VerifyResult(rv);     printf("Appending %s\n", appendPath);    rv = file->Append(appendPath);    VerifyResult(rv);        printf("Check For Existence\n");    PRBool exists;    file->Exists(&exists);    if (exists)        printf("Yup!\n");    else        printf("no.\n");    rv = file->Create(whatToCreate, perm);      VerifyResult(rv);    rv = file->Exists(&exists);    VerifyResult(rv);        if (!exists)    {        Failed("Did not create file system object!");        return;    }    }    