Questions about opening stacks

[Revinfo1155 at aol.com]

When I try to open a stack file by clicking on the file itself it doesn't 
open the rev application. Is this normal?

On my Mac sys 10.2.4, often when I try to open a stack thru the rev 
applicatio/file menu -when I locate the file it is dimmed or disabled? Why

As always -thanks for the help
jack
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