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When you click on a file attachment in QuickBase, Internet Explorer will normally prompt you to either "save" the file to disk or to "open" it.
However, if you once uncheck the "Always ask before opening this type of file" option in the Save dialog, Internet Explorer will henceforth open the file without prompting.
If you later decide you want to save the file to disk instead, you can save a file by clicking right on the file attachment name and selecting "Save Target As..."
Note that due to limitations in Internet Explorer it is not always possible to tell the file's type from the extension of the file attachment. For example, with Microsoft Excel installed, files with the extension ".csv" are actually downloaded as files of type "Microsoft Excel Worksheet" (aka .xlsx) files.