One way browsers get around handling incompatible data types is to convert them into a base 64 representation that uses only basic ascii characters. Tiddlywiki encodes non-text tiddlers in the same way. Browsers can, give the correct mime type, treat the base64 encoded string as though it were binary data for common data types. So to download the binary versions of the base64 encoded file you can create a download link that points to the base64 encoded string with the proper prefix describing the mime type and encoding and it will download the binary file. The macro creates a link that does exactly that, so when you click on it you get prompted to download the file.
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