Adobe InDesign is the primary software to open this type of file(s). If you don't have indesign, you can use indesign viewer (a small/free tool) to open and read this. Also you can convert this one to a .pdf or jpeg file. It is better to ask your art worker to send the file again as .jpg or .pdf format/extension. This can help you to open the file easily.
It is better to convert the file to PDF by following 2 ways: 1. Upload your InDesign file to Document Cloud and create a pdf 2. Upload InDesign file to Creative Cloud to download it in PDF format.
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1. Upload your InDesign file to Document Cloud and create a pdf
2. Upload InDesign file to Creative Cloud to download it in PDF format.