I believe this script is no longer maintained as View now includes
a built-in file-requester.
>> ? request-file
REQUEST-FILE /title title-line button-text /file name /filter filt
/keep /only /path /save
Requests a file using a popup list of files and directories.
REQUEST-FILE is a function value.
/title -- Change heading on request.
title-line -- Title line of request (Type: any)
button-text -- Button text for selection (Type: any)
name -- Default file name or block of file names (Type: any)
filt -- Filter or block of filters (Type: any)
/keep -- Keep previous settings and results
/only -- Return only a single file, not a block.
/path -- Return absolute path followed by relative files.
/save -- Request file for saving, otherwise loading.