Dear SharePoint Developers and Designers —
FYI, this is just some good information regarding SharePoint, DWP Web Parts, exporting, reusable Web Parts. and etc.
It turns out that one may get a Run-Time-Error (RTE) saying the Web Part “couldn’t be downloaded” when trying to export a Web Part.
Well, it turns out that it is due to a setting in IE.
Specifically, the setting to turn off (uncheck) is…
Tools, Internet Options, Advanced, Security, Do Not Save Encrypted Pages To Disk = Not Checked
…so if that is not checked then a Web Part can be exported.
I offer my thanks to the following link, which seems largely unrelated but it did point me in the right direction…
Reference: SharePoint, Export, Web Part, Web Parts, WebPart, WebParts, DWP, Save, Couldn’t Be Downloaded, Do Not Save Encrypted Pages To Disk, Internet Explorer, IE, Bug, Issue, Problem, Fix, Workaround, Tweak, Development, Coding, Reusable,
I hope this saves someone some time somewhere.