There are a number of reasons for limiting file attachments.  1)  Since attachments aren't checked and someone could upload anything, it protects both members and the site from malicous, against the TOS, and etc. type files being hosted here. Or at least attempts to.  2) Same reason folks are limited to one upload per day in the galleries and free stuff items need to be hosted off site.   File space is not infinite, it costs money, and the forums were not originally meant to be used as free storage space.  

Correct me if I'm wrong Mark, but I doubt anyone will complain about the occassional file_with_extension_changed thing you are doing now.  It's probably not a big deal in the Carrara forum since most folks seem to want to only help eachother and want to share pretty small files.   However, other forums have a bigger potential for abuse.  Anyway, if you need a place to host or store files, there are free alternatives.

Irene 

VistaPro Forum Coordinator     

Irene-