Files with the .inx file extension are XML-formatted documents that are exported by the Adobe InDesign software application. These documents are used to describe a specific InDesign file, explaining the number of pages that are contained in the file, the contents of the pages and the layout and settings for each page of the file.
INX files are commonly used to save a file that was created with a newer version of the InDesign into a format that is compatible with older versions of the InDesign application. The InCopy and GoLive applications also use the .inx file format for this same purpose.
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If you have additional information about the INX file format or software that uses files with the INX suffix, please do get in touch - we would love hearing from you.