Hi, sorry for the terse answer!
Its the syntax for combining this

open(FH, "<$file");
binmode(FH, ":crlf");
[download]

The :crlf bit just tells perl to look for varients of line-ending sequences & turn them all into "\n".
there is more info in the Cammel book.

Update
In the "open" documentation, Page 754 in the 3rd edition.

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