Hi folks! I know very little about streams and files, so maybe is quite stupid my problem. Try to evaluate this code: |segment| segment := ImageSegment new. segment copyFromRoots: (Array with: 'something') sizeHint: 100000 areUnique: true. segment segmentName: 'segmenttest'. (ImageSegment segmentDirectory newFileNamed: 'whatever') nextPutAll: segment segment. You will raise the error: "Improper store into indexable object" So, I am using a MultiByteFileStream and I am trying to write a WordArrayForSegment. I don't understand MultiByteFileStream>>nextPut: aCharacter because it does: nextPut: aCharacter aCharacter isInteger ifTrue: [^ super nextPut: aCharacter]. xxxx....xxxxx And super is MultiByteFileStream >> nextPut: aChar which does buffer1 at: 1 put: char. But here, char is not a char, but 1929386344 which is a LargePositiveInteger and then, of course, it fails when it does buffer1 at: 1 put: char. So, does someone have an idea of what can be wrong ? Thanks a lot in advance, Mariano