Since I do hope the Extension Changer method might make life easier, I should also note that I've seen a variation in file size when I use 3DX to convert older props one by one. I'm not sure why this is occurring. It could be that the 3DX default texture resolution of 1024 differs from original.

But, even at 2048, when I look at the same door for example, I think the conversion is blurrier than just swapping out the extension in a test I did, even though the polygon count remains constant.

So, I now have to think that unless the 3DX process is providing some benefit I'm not seeing, or Reallusion advises against it, I'll go for the extension change.

What I recommend for the process though is a different program called ScanDir from skybird.net which is free, has no adware, and which I trust 100%.
http://www.skybird.net/ScanDir/

Unopened 2/3D Software Junkie - Asus M5A97 w/FX8320 +16 GB, Radeon R9 280.

Since it's bound to be a new program to everyone, I should provide some tips for this procedure.
First I recommend that you simply copy over the .vns files to the proper iClone props folder using whatever process you normally use. No thinking involved there and you maintain the original files in VNS format somewhere else.

Then practice with one file in ScanDir. Open it up and navigate to that file. Right click when file selected and choose Rename. A new panel with 5 sections opens up. Ignore all but #5 for Extensions which lets you choose Replace. Click that, put in iProp (no dot) and select Remember Parameters.

Clicking Okay brings up all kinds of confirmation warnings but go ahead and you are done the test one. Then go back and select all the remaining files and do the same in bulk. I've yet to try entire folders because I like to see what's happening and don't want to change the wrong extensions for characters or textures by mistake. Pretty quick regardless.



Unopened 2/3D Software Junkie - Asus M5A97 w/FX8320 +16 GB, Radeon R9 280.

I late on this, but I gave up trying to make the conversion of vns files back in January.

Someone mentioned Reallusion had made a conversion of all the content with vns files and they are now starndard downloads.
I have a lot of content files. Is there a listing of these converted files. 
This way I hope to just go down the list and replace those files.