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I just found a file that I can READ but not OPEN a port to. This 
bug can be seen on old and new versions of Core 
and View:
>> read %"/j/anton/mp3s/more/test-copy.mp3"

== {ID3^C^@^@^@^@^F^NTMED^@^@^@^D^@^@^@DIGTLEN^@^@^@^G^@^@^@472006TCON^@^@^@^E^@^@^@miscTRCK^@^@^@^B^@^@^@5TALB^@^@^@^\^@^@^@Psych
o...
>> port: open %"/j/anton/mp3s/more/test-copy.mp3"
** Access Error: Cannot open /j/anton/mp3s/more/test-copy.mp3
** Near: port: open %/j/anton/mp3s/more/test-copy.mp3
>> port: open/binary %"/j/anton/mp3s/more/test-copy.mp3"
** Access Error: Cannot open /j/anton/mp3s/more/test-copy.mp3
** Near: port: open/binary %/j/anton/mp3s/more/test-copy.mp3
>> read/binary %"/j/anton/mp3s/more/test-copy.mp3"
== #{
4944330300000000060E544D454400000004000000444947544C454E00000007
00000034373230303654434F4E000000050000006D6973635452434B0000...

Yes to save resources.  For example, what if I just read an MP3 file 
into a word? I want to free that word so that it no longer is allocated 
to that data.

If you want to load more MP3s, it would be a good idea to reuse the 
same memory area. An example:

>> f: func [/local blk] [blk: []]   
>> a: f
== []
>> insert a 42
== []
>> a
== [42]
>> source f
f: func [/local blk][blk: [42]]
>> clear a
== []
>> source f
f: func [/local blk][blk: []]


You see, A and BLK inside F points to the same memory. Next time 
you call F, you can put some more stuff in BLK (read another MP3).

If you want to be able to completely remove BLK, I would do that 
using an object. Build the MP3 player as an object, instead of just 
a function. Makes sense?

load-mp3-data: func [file /local contents][
	contents: read/binary file
	; <- modify contents here
	also contents contents: none
]

data: load-mp3-data %song.mp3

Will... I want to make a private mp3 stream server to play music 
on a local network. So it must be solved on the server side... read 
only enough sound data from disk to play and distribute it to listeners. 
I have already the mp3 parser to get for example enough data to play 
during specified interval of time. Now it's just how to distribute 
it and don't send more data than is necessary  for the listeners.

wish for R3 / Topaz / Red / World:

Add possibility to extend "read" and "load" to let them transparently 
load also custom file types (.tiff, .mp3 etc.)
Use something like:
system/mime: context [
	JPG: context [
		extensions: [%.jpg %.jpeg ...]
		header: #{JFIF}
		open: func [...]
		read: func [...]
		load: func [...]
		save: func [...]
		write: func [...]
		close: func [...]
	]
	...
]