Note: Now that bookmarks can be shared between users (without importing them), there should be little cause for importing a bookmark file directly. See Sharing bookmarks with other users, which is almost certainly what you really want to do.
The old .bmk bookmark files are no longer created by Hyperview, and will only be found in association with pre-10.6 versions of Hyperview.
To import a legacy .bmk bookmark file:
<project name>.bmk
file.