Read only in shared folder

[vcff]

I had created a worksheet which I placed in the shared folder in the server.
This worksheet is for everyone to access and update accordingly.
However, the file can only be open by others as read only, even I have not
select the READ only option under the General Option.

How can I place the file in the shared folder and allow others to edit and
save as and when required?

Any help will be appreciated.

Thanks & Regards

vcff