[fpc-pascal] Unicodestrings and Assign(File)

[Jürgen Hestermann]

Is it (already) possible to use Unicodestrings for file paths?
I was able to access long paths (with many hundreds of characters)
in the windows API functions FindFirstFileW (with Win32_Find_DataW
data type) but I failed to open such files with Assign(File)/reset.
Are they converted to (one byte) Ansistring internally?
Am I forced to use CreateFile or similar function to open such files?