directory name: A string representing a directory. The string can contain logical names.
filter list: A string representing a list of file filters, including wildcard characters separated by the ‘|’ character. For example: '*.xml|*.xsd'. If the value of this argument is an empty string, all files in the directory will be listed.
sub dir search: A boolean parameter. True means that the directory and all subdirectories are searched. False means that only the specified directory is searched.
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