open (FILE, ">:raw:perlio" . $att->{filename});

[download]

:raw removes default layers which may transform the data being printed. :perlio reintroduces buffering.

> instead of >> replaces existing files instead of corrupting existing files by appending to them.

Update: Added explanations.

In reply to Re: Downloading Gmail attachments - Corrupted saved file by ikegami
in thread Downloading Gmail attachments - Corrupted saved file by casimo

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