It works now.

Looks like that:

1- I needed to do an asString on the content being read. (I'd like to know how to read a text file this way - as a text file)

2- as my separator was $;, not specifying one led NeoCSVReader to fail for some strange reason (it should have given me a single field and values in an array, which it didn't).

allObjects

| stream reader contents |

stream := self allObjectsDataFile asFileReference readStream.

contents := stream contents asString.

stream close.

reader := NeoCSVReader on: contents readStream.

reader separator: $;.

reader upToEnd.