Why can't I open the zip files downloaded from cumulative projects?

after I download the zip folder, I double click on the file to open I get a ‘document is undefined’ error message.

Have you extracted the files?

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@mtf 's suggestion, whilst probably quite obvious, is likely right. :slight_smile:

One of the worst things Microsoft ever did with Windows (imho) was make it possible to directly open ZIP archives within Explorer…

The number of times I’ve had people ask why something’s broken, only to find that they’re trying to work directly with a file still inside the archive

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extracting worked thank you!