I haven't tried it, but have a look at 

PharoFilesOpener>>#unsetInformAboutReadOnlyChanges
  "Make sure the user is *not* informed when the .changes file can not be 
written to."
  shouldInformAboutReadOnlyChanges := false

> On 31 May 2016, at 13:22, Valentin Ryckewaert <valentin.ryckewa...@gmail.com> 
> wrote:
> 
> Hello everyone,
> 
> I'm trying to execute a script from a .st file on a image whose changes file 
> isn't writable.
> When i do this, I'm getting a bug with primSize... It looks like get size of 
> the file need write access ?
> The exception :
> Primitive failed: primitive #primsize: in MultiByteFileStream
> 
> Does someone have an idea of the reason of this problem please?
> 
> Valentin


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