Microsoft Word Error '800a1528'

'the setting could not be created'

I've just migrated a web-based vbscript process to w2k, which uses server-
side word to create a new doc from a template and populate it from a form.
Now, this was working fine on NT4, but now, when

wordapp.options.defaultfilepath(wdUserTemplatesPat h) = strpath

is called, it throws the above with
'the setting could not be created'

I'm assuming its a perms issue, but the iusr account has exe perms on the
office folder, and the perms on the template folder are fine.