By default, the Adobe InDesign CS2-CS4 INX file type recognizes the CS4-CS5 .inx file extension.
You can configure some aspects of SDL file types in Management > Linguistic Tool Setup > Filter Configurations.
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About the Adobe InDesign CS4-CC IDML File Type
About the Adobe InCopy CS4-CC ICML File Type
About the Adobe FrameMaker 8-13 MIF File Type
Adobe InDesign CS2-CS4 INX
Adobe InDesign CS4-CC IDML
File Types