int FileOpenHistory	(	string	filename,
		int	mode,
		char	delimiter = ';'
	)

Opens file in the current history directory

Parameters

filename	File name
mode	File open mode. Can be one or combination of values: FILE_BIN, FILE_CSV, FILE_READ, FILE_WRITE, FILE_SHARE_READ, FILE_SHARE_WRITE
delimiter	Delimiter for csv files. By default, the ';' symbol will be passed

Returns

Returns the file handle for the opened file. If the function fails, the returned value is -1.
To get the detailed error information, call the GetLastError() function

FILE_SHARE_WRITE and FILE_SHARE_READ flags should explicitly be specified for shared use when opening files. If the flags are absent,
the file is opened in exclusive mode and cannot be opened by anyone else till it is closed by the user who opened it.