Environment

• Pythonnet version: 3.0.3
• Python version: 3.10.11
• Operating System: Windows 10
• .NET Runtime: 4.5

Details

• Trying to load DLL using AddReference.

import clr
clr.AddReference("C:\MyProject\TestFolder_Dependencies\MyDLLProject\Test.TA.MyVersion.Test.dll")

System.ArgumentException: Illegal characters in path.
at System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional)
at System.IO.Path.Combine(String path1, String path2)
at Python.Runtime.AssemblyManager.d__15.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at Python.Runtime.AssemblyManager.LoadAssemblyPath(String name)
at Python.Runtime.CLRModule.AddReference(String name)

DLL is not a new implementation. Same DLL and same path was working fine with python 3.7 and PythonNET 2.4.0. This issue started happening when we upgraded python and Pythonnet versions.