Where is $bbuserinfo[attachmentextensions] created?

[JamesAB]

I need to use a hook to modify the extensions listed in $bbuserinfo[attachmentextensions] found in the newpost_attachment template.

Maybe I'm blind, but I haven't been able to find where $bbuserinfo[attachmentextensions] is set.

Any help would be appreciated.

Thanks,
James

[JamesAB]

I found it in functions.php in function cache_permissions

Unfortunately, I don't think I can use a hook to change how the string is first set.

I guess I'll have to use a hook to remove extensions from the string afterwards.