Howto disable file extension check on frontend upload?!

[Makulia]

Hello!

I want my users to upload any filetype. Howto disable file extension check on frontend upload?!
I haven't seen any options in backend!

Thank you!

[gelöscht durch Administrator]

[Arno]

I want my users to upload any filetype.

This is not a good idea for security reasons. So it is not possible.
When users need other file types he can always use the zip format. This is the normal used procedure.  

[Makulia]

I know, that it is security risk. Just want to know if it is possible.
Ok, if so, it would be great to have black list. Allowed all exept: .exe .php etc. Because I know exactly, what types are disallowed, but list of allowed extensions would be to big. Also i want to implement preview for some filetypes (Google Viewer etc)