iif(file('file2.bmp'),'file2.bmp','file1.bmp')

>I need to print two file *bmp in my report: if exist the second *bmp, must be printed the second, otherwise must be printed the first (that is always present instead of the second). I put in 'print when' file("myfile2.bmp"), but it return an error if the file do not exist.
>Some suggest please?