Writing Unicode characters to scripting parameters on Windows

I am trying to read/write a file path that supports Unicode characters to/from scripting parameters (PIDescriptorParameters) with an Export plug-in. This works fine on OS X by using AliasHandle together with the "typeAlias" resource type in the "aete" section of the plugin resource file.

On Windows I am having trouble to make Photoshop correctly display paths with Unicode characters. I have tried:

- Writing null-terminated char* (Windows-1252) in a "typePath" parameter -- this works but obviously does not support Unicode.

- Writing null-terminated wchar* (UTF-16) in a "typePath" parameter -- this causes the saved path in the Action palette to be truncated to the first character, caused by null bytes in UTF-16. It appears PS does not understand UTF-16 in this case?

- Creating an alias record with sPSAlias->WinNewAliasFromWidePath and storing in a "typePath" or "typeAlias" parameter -- this causes the Action palette to show "txtu&", which does not make sense to me at all.

The question is: what is the correct scripting parameter resource type (typePath, typeAlias, ... ?) for file paths on Windows, and how do I write to it in such way that Photoshop will correctly display Unicode characters in the Actions palette?