D2Kutil replacement in Oracle 12c Forms

In Forms 6i I used the D2KUTIL package to locate a list of csv files having a particular naming pattern, read them one by one and copy them to a different location using the D2Kutil package.  The following were used:

WIN_API_DIRECTORY_LIST.FirstFile,WIN_API_UTILITY.Copy_File,WIN_API_DIRECTORY_LIST.NextFile,WIN_API_UTILITY.DELETE_FILE

I understand that D2KUTIL package is no longer supported in 12c and the webutil package should be used instead.  However, what are the replacements for all the functions given above? 

For example, I have a scenario where the following files exist in a directory of a server(d:\csv)