CS 3.0.1 will not open InDesign files created in 2008  - it says a plug-in may be missing.

My CS 3.0.1 will not open InDesign files created in 2008.  It says a plug-in may be missing.  I did have a computer crash since I last opened it.  I've tried changing the extension to inx, but that doesn't work.  I cannot get the file to open.  Can someone help?
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The OP is using CS. He/she could be trying to open CS2 or later.
Simply changing the file extension will do know good and only an INX exported from CS2 will work.
Bob