That's a lot of complains but not enough information to help you.
OpenOffice doesn't threat files as read only unless it is open with some
other application
this normally happens when you open an attachment from a mail tool, but
as you don't give enough information we can't help you.
On 28-6-
I often download a .csv file from a web site. I look at it and do a sum
or two then close it without saving. Excel has no problem with this.
Calc seems to think every file is important, or maybe the programmers
just give OpenOffice excessive importance but these are throw away files
and even i