Rename multiple files for one entry

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1

The funcionallity of renaming files is great, but I have some bibtex entries, which have mutiple pdf files attached.
So only one file of the same type is renamed using \bibtexkey as Filename format pattern:

@InProceedings{MustermannTitelOfThisPaper,
  author    = {Mustermann, Thomas and Musterfrau, Olivia},
  title     = {Titel of this paper},
  file      = {:img/MustermannTitelOfThisPaper.png:PNG image;Poster:pdf/MustermannTitelOfThisPaper.pdf:PDF;:pdf/DifferentName.pdf:PDF},
}

with the files:

  • MustermannTitelOfThisPaper.pdf
  • DifferentName.pdf

But what I need and haven’t found yet is also a possibility of adding a number, if needed, like:

@InProceedings{MustermannTitelOfThisPaper,
  author    = {Mustermann, Thomas and Musterfrau, Olivia},
  title     = {Titel of this paper},
  file      = {:img/MustermannTitelOfThisPaper.png:PNG image;Poster:pdf/MustermannTitelOfThisPaper1.pdf:PDF;:pdf/MustermannTitelOfThisPaper2.pdf:PDF},
}

with the files

  • MustermannTitelOfThisPaper1.pdf
  • MustermannTitelOfThisPaper2.pdf
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