Samurai Shodown: take samsho.zip and samshoh.zip from MAME 0.131u4. Combine all the contents into samsho.zip. Add the layout.xml listed here then rename as .rpk once again and run in MESS.

Code
<?xml version="1.0" encoding="utf-8"?>
<romset version="1.0">
   <resources>
      <rom id="program" file="045-p1.bin" crc="dfe51bf0" sha1="2243af3770a516ae698b69bcd9daf53632d9128d"/>
      <rom id="program2" file="045-p2.bin" crc="38ee9ba9" sha1="48190699a6be83cb6257365ae81f93fdd23abe09"/>
      <rom id="tiles" file="045-s1.bin" crc="9142a4d3" sha1="54088e99fcfd75fd0f94852890a56350066a05a3"/>
      <rom id="z80prg" file="045-m1.bin" crc="95170640" sha1="125c502db0693e8d11cef619b090081c14a9a300"/>
      <rom id="ymsamples" file="045-v1.bin" crc="37f78a9b" sha1="6279b497d12fa90b49ab5ac3aae20fb302ec8b81"/>
      <rom id="ymsamples2" file="045-v2.bin" crc="568b20cf" sha1="61af858685472a1fad608e230cccc2b108509ddb"/>
      <rom id="sprite1" file="045-c1.bin" crc="2e5873a4" sha1="65c74c1e2d34390666bbb630df7d1f4c9570c3db"/>
      <rom id="sprite2" file="045-c2.bin" crc="04febb10" sha1="16a8cbf0fd9468e81bf9eab6dbe7a8e3623a843e"/>
      <rom id="sprite3" file="045-c3.bin" crc="f3dabd1e" sha1="c80e52df42be9f8b2e89b467b11ab140a480cee8"/>
      <rom id="sprite4" file="045-c4.bin" crc="935c62f0" sha1="0053d40085fac14096b683f4341f65e543b71dc1"/>
      <rom id="sprite5" file="045-c5.bin" crc="a2bb8284" sha1="aa118e3b8c062daa219b36758b9a3814c08c69dc"/>
      <rom id="sprite6" file="045-c6.bin" crc="4fa71252" sha1="afe374a9d1f2d955a59efe7b6196b89e021b164c"/>
   </resources>
   <configuration>
      <pcb type="standard">
         <socket id="p1" uses="program"/>
         <socket id="p2" uses="program2"/>
         <socket id="s1" uses="tiles"/>
         <socket id="m1" uses="z80prg"/>
	 <socket id="v11" uses="ymsamples"/>
	 <socket id="v12" uses="ymsamples2"/>
	 <socket id="c1" uses="sprite1"/>
	 <socket id="c2" uses="sprite2"/>
	 <socket id="c3" uses="sprite3"/>
	 <socket id="c4" uses="sprite4"/>
	 <socket id="c5" uses="sprite5"/>
	 <socket id="c6" uses="sprite6"/>
      </pcb>
   </configuration>
</romset>