Thanks for the info on the Plugin Help file, here is the print from that file with no sight of the X Plane Plugin. A bit mystified by it.
Airfoil .sof import plugin - Version 1.0 - by Inivis
3DS ASE export plugin - Version 1.1 by Inivis
Auto Planar UV - Version 2.01 - TFPSoft, LLC
Bas relief from texture - version 1.0 - Dennis Hawthorne
Centre plugin V1.1 - by Takashi Matsuda
Collada Export Plugin - V1.2 - by Inivis/Dennis Hawthorne
DDS File loader v1.01 - by Jeff Duncan (support 'at' virtualplatypus.com)
Direct X Plugin - Version 1.9 ( Jul 20 2012 ) - by F. Meinert
Divide Loop - version 1.0.1 - Dennis Hawthorne
DXF Export Plugin - V1.2 - by Inivis
Field Import Plugin - Version 1.2 - by Inivis
Greeble - version 1.1b - Dennis Hawthorne
Jpeg image loader V1.2 by John Stone/Inivis
Knife - version 1.3 - Dennis Hawthorne
LDraw ( Lego ) Import/Export - Version 1.1 ( Jul 20 2012 ) - by F. Meinert
Line command plugin - Version 1.0 by Inivis
LightWave LWO export plugin - Version 1.01 by Dennis Hawthorne
Lightwave LWO Import Plugin - Version 1.0 - by Dennis Hawthorne
Automatically sets the materials on a model based on crease angle. Material Angle Plugin - Version 1.0 - TFPSoft, LLC
Milkshape Export Plugin - Version 1.1 - by Inivis
Milkshape Import Plugin - Version 1.11 - by Inivis
Wavefront OBJ export plugin - Version 1.4 by Dennis Hawthorne
OBJ Import Plugin - Version 1.5 - by John N. Huffman
OFF Import Plugin - Version 1.1 - by Inivis
PNG image loader V1.2 by Trent Gamblin/Inivis
Points Import Plugin - Version 1.1 - by Envies
Polyhedron maker V1.3 - by GWMichel
PPM image loader V1.0 - by John Stone
Quake Map Export Plugin - Version 0.4 - by Inivis
Render to Texture Plugin - Version 1.01 - TFPSoft, LLC. Renders the current lighting or normals to a texture map.
This allows lighting to be stored for later realtime rendering.
save 3D PNG plugin V1.31 by Inivis
Second Life Sculpted Prim plugin, version 1.2a - TFPSoft, LLC / Inivis
Second Life Box Export Plugin - Version 1.0 - by Inivis
SMF Export Plugin - V1.2 - by Joerg Schmalzl, modified by Edward Patel
SMF Import Plugin - Version 1.4 - by Joerg Schmalzl, modified by Edward Patel
STL/TXT Import Plugin - Version 1.0 - by Evelyn Miralles/Titan Inc.
T3D Export Plugin - Version 1.0 - by Inivis
Terragen Terrain Import - Version 1.0 - import plugin by TFPSoft, LLC. Terragen by Planetside Software.
Targa image loader V1.12 - by John Stone/Inivis
UVMap - version 1.0.1 - Dennis Hawthorne
X3D Import/Export Plugin v1.0.4, by Rick Kimball
http://ac3d.kimballsoftware.com/