Hello,
What do you mean with : solution suggested by SAS?
Have you found a usage note or problem note talking about this?
Have you contacted Technical Support?
I would definitely do the latter (contacting TS) with questions like this one.
I have used Enterprise Miner for more than a decade (almost two decades) until 2018 (using Model Studio in VIYA nowadays) but I cannot remember this behavior.
I must admit though I was rarely uploading external files into Enterprise Miner (File Import node). I always had an Analytical Base Table in SAS format (in a SAS library).
Good luck,
Koen