Change to "read only" after document is open

[Eric]

(In Word 2003)

Word permits Open Read-Only at the time a document is opened. But sometimes
I open a document and then only later realize that I want to avoid saving it.

Is there any way to change to "read only" after opening a document, as if it
was opened read-only in the first place?

Thanks.

 

[Eric]

Thanks. Good idea.

There have been too many times that I've been working on multiple versions
of the same file, and I've inadvertently overwritten the original rather than
the new version.