Bagged a brace of 'em (Papasmrfe's Bird, Kirwyn's K, Sarina's Patio, M3 Norman's Outfit (Lourdes), NEA's Expressions, P4f 80's Bob Hair, Lover's Choice, V4 Fighter's Tunica, DM Production Pz3's, Ben & Kate, !!DMShi&Dal, Elegance&Grace, V1 Dierdre's Clothing, Lisa's Botanicals, !DAZ's Wyvern, DAZ's Troll, DAZ's Girl 4, DAZ's Girl 4 Hair, DAZ's Hiro 4 Materials, 1_Full Head & Face, Dreams & Reality, V2 Gypsies&Genies MATs, All_Flowers & Chains) <== only noted here as a quick reference when I decide to fix them!

There's one, but only one, that I've definitely used recently, so I ran Poser 6, loaded the V4 Fighter's Tunica, and quit. And there it is in the XML file (don't forget that Renderosity's forum software, combined with my initial failure to escape them when posting, screws up the backslashes when I edit the post!)

    <ContentFolder folder="H:PoserFreebiesRuntimeLibraries"  index="6" >
        <Library libraryType="2"  curLibraryFolder="character!HairAnime Girl Kristen Conforming Hair" />
        <Library libraryType="1"  curLibraryFolder="pose" />
        <Library libraryType="9"  curLibraryFolder="materials" />
        <Library libraryType="8"  curLibraryFolder="props!Gear PropsV4V4 Fighter's Tunica (ADP" />
        <Library libraryType="7"  curLibraryFolder="hair" />
    

But when I run Poser 6 again, no XML error. Well, not straight off anyway - but I played around for a bit and it came up exactly as before - line 43.

One remaining curiosity - the unescaped apostrophe is on line 51, not 43...

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).