The .zdl file extension is most commonly associated with the Avery DesignPro label application. Avery DesignPro is used to create labels that can be printed on a user's computer. The ZDL files store the label information including the size and layout of the label and any text or graphics that the label will include. These labels can be used for mailings, business cards, dividers, CDs and even t-shirts.
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If you have additional information about the ZDL file format or software that uses files with the ZDL suffix, please do get in touch - we would love hearing from you.