The problem is that I don't see any encoding in the drop-down list of available encodes on Netbean project property that match any of the names that DOS character set have. I have installed Netbean PHP, but I don't think that make any different.
In a strict sense :
This character set was not conceived as a code page.
It was simply the graphical glyph repertoire available in the original IBM PC.
This character set remains the primary font in the core of any EGA and VGA-compatible graphics card.
Text shown when a PC reboots, before any other font can be loaded from a storage medium.
The standards ISO 8859, currently defined in 15 different 8-bit character sets for information exchange. The structure of the character set corresponding to the first 128 positions of the characters of the 7-bit ASCII character set.
ISO 8859-1 is next to US-ASCII and UTF-8, the most important and most frequently used character set. And the best choice to use it in Netbeans as a 437 replacement.