#10 x64 version fails on openFile

[Peter Delmen]

'ActiveX_x64_1_1_8_7.zip (398.8 kB):
Call npp.activeEditor.newFile()
'new succeeds
Call npp.activeEditor.write("written by the example script!")
'write succeeds
Call npp.activeEditor.openFile( [path my_textfile.txt] )
'openFile fails (crash)

'ActiveX_x64_1_1_8_7 x86:
'new succeeds
'write succeeds
'openFile succeeds

'same behaviour:
'win10, win11, npp 8.9.7, several previous npp versions
'admin - non admin, in process - out of process

'what is wrong?