dt_getobjwithprop_u system procedure

Hi All,
Please tell me what this procedure dt_getobjwithprop_u does.
Thanks in advanced,
TNrun this and problem should be cured. so sayeth the infallable BOL.

alter table dbo.dtproperties add uvalue nvarchar(255) null
go
if exists(select * from dbo.dtproperties) exec('update dbo.dtproperties set uvalue = convert(nvarchar(255), value)')
go