HCL Domino Ideas Portal
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The current way that the name is given by the name of the actual file ensures that those names are usable. Even so, the attachment may be attached on a different platform than detached, and then the extension may be invalid.
If renaming would be allowed, it should be validated that the name is valid, at least in the current platform.
At the moment a workaround is to extract and delete the attachment, rename the file and then re-attach it. This is probably much easier, that a LotusScripr® enhancement. Don't know how often such a rename would be used at all.