Translating entire Storyline files with an alternative method

I had a look in my programming from april

that's what I have done to convert audios from one language to another

prepare:
 - folder 1 with all mp3 (original language)
 - folder 2 with all mp3 (translated language) - same file name like in folder 1

step 1: for all audios in the media library (story/theme/theme.xml)
 - replace all audios paths with the corresponding audios from folder 2
 - update all audio properties
   (md5 <steam + source>, useCnt, bytes, originBytes, date, ...)

step2: for all audios in the media library files (story/media/.... .mp3)
 - replace all audios with the audios from folder 2 - files renamed with the original internal filenames

=> i re-use the old IDs and internal filenames from the original language audios for the translated audios
=> i suspect that is exactly the problem

unfortunately I could not find out how to generate the new internal file name for a new generated ID

but maybe there is someone who knows (@articulate ???)

Jürgen