Found the missing saved files !

Poser(Python) saved them to C:\Users\Public\Documents\Poser 9 Content*.
Not the runtime subfolder of that, but directly into that folder. So if you call mat.SaveMaterialSet(filenameonlywithoutpath), as per the manual, it puts the MT5/MZ5 in the same folder as your runtime folder, which is NOT where anybody would want it.

*which is where the default Poser 9 content was installed. And that begs the question, why does my library preferences file say this ?

<?xml version="1.0" encoding="UTF-8"?>

<LibraryPreferences curFolder="0" version="1" previewNum="100" limitPreview="0" doubleClickReplace="0" >

<ContentFolder folder="C:\Program Files (x86)\Smith Micro\Poser 9\Runtime\libraries" index="0" searchIndexed="1" />

<ContentFolder folder="C:\Program Files (x86)\Smith Micro\Poser 9\Downloads\Runtime\libraries" index="1" searchIndexed="1" />

<CollectionFolder folder="Runtime\libraries\Collections" index="0" />

</LibraryPreferences>

(I wonder if that explains the problem I was having with P3DO ?)

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).

Forum: Poser Python Scripting

Subject: What path is used for actor.Load/SaveMaterialCollection(FileName) ?