microsoft.com/en-us/library/ms646839.aspx.
Filter: The filter parameter is an array of two-element arrays. The first member of
each two-element array is a string with a description, and the second is a string with
a wildcard. This lets the user select the type of files displayed. The program has two
filters: an Access database filter showing only files with an .mdb extension, and an ???all
files??? filter showing all files. Although virtually all Access databases have an .mdb
extension, it??™s convention to give the user the option of viewing all files. Note that this
file-type filtration mechanism is intended for convenience and not for security. If the
user types a new filter into the file name box and presses Enter, that filter will override
the programmer-supplied filters.
Flags: This parameter is a bit field. You set individual options by bitwise ORing
them together. (It would be more Ruby-like to instead use an options hash, but the
designer of this interface has chosen to stick more closely to the Win32 API.
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