Apple Macintosh LC 630 DOS - Manual (Page 170)

You use Macintosh Easy Open software to open a document when you don’t have the
application that created it.
When you choose Open from an application’s File menu with Macintosh Easy
Open installed, you may see more documents than you did before. You’ll also
see additional information when you use a list view of the files in a folder
(including DOS, Windows, and ProDOS documents).
Choosing an application to open a document
Without Macintosh Easy Open, you see this message when you try to open a
document created by an application missing from your computer.
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Appendix D
Using Macintosh Easy Open
Follow the instructions in this
chapter if you have problems
opening some documents.