Open any internal Firebird database. Open a table for editing or create a new table. There is a data type Binary(fix)[CHAR]. Choose this type for a field.

After saving the table open the table for data input. The field will get an <OBJECT>, so it couldn't be filled in the table view.

Create a form for it. I have tried many fields, also the image-control, which is the only field for read binary data. No possibility to get data into this field type.

Now reopen the table for editing. Look at the field. The type will have switched to Text(fix)[CHAR].

Don't know where Binary(fix)[CHAR] should be for. But a field, which couldn't be filled with content through a form or directly through the table view, should be removed from the table editor.