declare
	
filename varchar2(256); -- full path to file
filemode1 char := 'R'; --for read
file1 win_api.file_type; -- file type variable
raise_exc BOOLEAN := FALSE; --not sure here
buffer1 varchar2(100); --not sure here
read_file1 BOOLEAN := FALSE; --reading file
bytes_read number(2); --not sure

begin
	
filename := WIN_API_DIALOG.OPEN_FILEEX('Choose File...','%HOMEPATH%','details.csv |details.csv|');
file1 := WIN_API_FILE.OPEN_FILE(filename, filemode1, raise_exc); --works here i can later put full path on dialog

read_file1:=WIN_API_FILE.READ_DATA(file1, buffer1, 19, false, bytes_read, raise_exc); -- errors

WIN_API_FILE.CLOSE_FILE(file1, raise_exc);
msg('The chosen file is: '||CHR(10)||CHR(10)||filename||CHR(10)||CHR(10)||buffer1);

end;