Use of OPEN is discouraged

The OPEN command has a very complicated syntax which is difficult to get right.

It is preferable to use classes from the %IO package instead which are much easier to use and provide the same functionality.

For instance, for opening a file, instead of using:

    OPEN "myfile"

prefer using:

    #dim f as %IO.FileStream
    #dim status as %Status
    set f = ##class(%IO.FileStream).%New()
    do f.open("myfile",,,,.status)
    // check $$$ISOK(status)