Its kind of weird request because if a user is not intending to create a record then what's the point in attaching a file to it in the first step. If record is meant to be created then file can be attached to it later on. Attachment facility will only
be enabled after a record is created. One can easily show a small custom attachment window when a user will click 'New' for record creation. The only problem is how to tell CRM which record this attachement should be
linked to as record still needs to be created.
If problem is that users forget to attach a file and attachment is must for that record then you can make it compulsory to attach a file on record close after saving. You can show a little pop-up alert using JScript to a user that attachment must be filled
before closing this record and cancel the close operation of user.
Regards, Imran Abbasi