[Alex3d]

Hello
There's a problem with memory leak when I on try to open unsupported FBX (versions below fbx 2011)
Currently I am using a custom method to detect the fbx version before trying to read a file using powertoys library.

[abenedik]

I was not able to reproduce that problem. 

Using the latest version of Ab3d.PowerToys (11.0) and native Assimp library that came with that version (v5.2.5 commit hash 0dcfe2f; note that version has not changed for almost a year) seems to clear the resources - see the process memory screenshot after trying to load an old fbx file a few times:
   

Do you call the assimpWpfImporter.Dispose method when import exception happens?