I think that’s what @Koen5 @Was saying.
get files
For each file in %Files%
Change extension
End (Loop)
now they are all the right extension and you should be able to open them.
So, this would work if they are all meant to be opened with one program, example: they all come down in csv, txt, xls, xlsx, etc, and they can all be opened in Excel.
if that’s not the case and they are various different programs, like docx, xlsx, and pdf, then I would:
Get files
%For each %CurrentItem% in %Files%
Switch %File.Extension%
Case doc
Open with word
Case xls
Open with excel
Case csv
Open with Excel
Save as xlsx
End (Switch)
so you can define all the further actions taken under each case. You might need to spend a few rounds teaching it, but eventually, if you have a case for each post, then you will have what you need.
good luck.