How to get latest file using wait_for_file() function

Hi All,

I am facing issue using wait_for_file function, my requirement is in my source file path C:\FTP\PROD_20150314.csv  & PROD_20150314.csv two files having same name with different time factor. When I start  job want to take only one file that is latest one need to be process. How to set this option in wait_for_file function. currently I am using this pattern.

Substitution Param:

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$$Filepath = 'C:\FTP'

$$Filename = 'PRODUCT_*.csv'  (i.e. PRODUCT_20150314.csv)

Script:

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$PATH  ='[$$Filepath]';

$Filename = '[$$Filename]';

wait_for_file('[$PATH]'\\'[$Filename]', 0, 0, 1, $filestat);

$filestat = replace_substr($filestat,'/','\\');

What changes is required to get latest file from the path.

Thanks in Advance...!!!!

Regards,

Srini