- compiled script - xmms-wrapper.zip should be in this directory -
starting X11 app and passing dropable filennames to it - like xmms:
from - http://www.sccs.swarthmore.edu/users/00/ceg/computer/drop_xmms.html

on open these_items
	tell application "Finder"
		--Launch X11 and bring to front 
		launch application "X11"
		--String that will be executed by the do shell script command
		--First set the display
		--Remove the -e if you'd rather not append to the playlist, but replace it
		set theCommand to "DISPLAY=:0.0; export DISPLAY; /sw/bin/xmms -e  "
		
		--Process each file dropped on the droplet, appending the 
		--POSIX path of the file to the end of "theCommand"
		set theFiles to these_items as string
		repeat with i from 1 to the count of these_items
			set thefile to POSIX path of (item i of these_items as string)
			set theFiles to these_items as string
			set theCommand to theCommand & " \"" & thefile & "\""
		end repeat
		-- Finish theCommand string
		-- Pipe output to stdout and stderr so the command 
		-- returns and AppleScript won't wait around for 
		-- stdout and stderr to close
		set theCommand to theCommand & " > /dev/null 2>&1 &"
		do shell script theCommand
	end tell
end open

--
OSX doesn't like the mojo applescript uses so we add a CFbundleIdentifier manually it should look like this when done:
hints - http://forums.macosxhints.com/archive/index.php/t-32748.html

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>CFBundleAllowMixedLocalizations</key>
	<true/>
	<key>CFBundleDevelopmentRegion</key>
	<string>English</string>
	<key>CFBundleDocumentTypes</key>
	<array>
		<dict>
			<key>CFBundleTypeExtensions</key>
			<array>
				<string>mp3</string>
				<string>MP3</string>
				<string>.MP3</string>
				<string>.mp3</string>
			</array>
			<key>CFBundleTypeOSTypes</key>
			<array>
				<string>****</string>
				<string>fold</string>
			</array>
		</dict>
	</array>
	<key>CFBundleExecutable</key>
	<string>droplet</string>
	<key>CFBundleIconFile</key>
	<string>droplet</string>
	<key>CFBundleIdentifier</key>
	<string>org.binary.xmms-wrapper</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundleName</key>
	<string>xmms-wrapper</string>
	<key>CFBundlePackageType</key>
	<string>APPL</string>
	<key>CFBundleSignature</key>
	<string>dplt</string>
	<key>LSRequiresCarbon</key>
	<true/>
	<key>NSAppleScriptEnabled</key>
	<true/>
	<key>WindowState</key>
	<dict>
		<key>name</key>
		<string>ScriptWindowState</string>
		<key>positionOfDivider</key>
		<real>274</real>
		<key>savedFrame</key>
		<string>28 514 439 460 0 0 1280 1002 </string>
		<key>selectedTabView</key>
		<string>result</string>
	</dict>
</dict>
</plist>

then run ls register:

Kirara:~ binary$ /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -f /Applications/xmms-wrapper

it should allow association after that. zipping/deleteing/unzipping the wrapper may be needed.

yay xmms in OSX