Enterprise Vault 10: Files lost extension

Hi All,

recently we have an issue with Enterprise Vault 10. We can see mails saved, but, when we restore them, the files attached to these mails have lost their extension and they are renamed as Part.001, Part.002, ...

Anyone knows what can be the origin of this issue and, in case it can be resolved, how to proceed to do it?

Thanks a lot in advance,

Bruno