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create plist file programmatically
NSFileManager *manager = [NSFileManager defaultManager];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    ur= [documentsDirectory stringByAppendingPathComponent:@"download.plist"];

NSMutableArray * plist2 = [NSMutableArray   arrayWithContentsOfFile:ur];
    [plist2 addObject:nameDictionary];
    if([manager fileExistsAtPath:ur] == NO)
    {
        [manager createFileAtPath:ur contents:nil  attributes:nil  ];// empty plist file

    }
    [manager release];
    [plist2 writeToFile:ur  atomically:YES];