Gaming NDS No-Intro collection new numeration

[syndrom3]

Hi! Recently no-intro website introduce a new numeration for the NDS ROMs archive. So now they have the roms from 0001 to 5975 and the new ones starting from z001. Anyone knows the reason why they change the numeration? I've searched the website but I found no answer.
Thanks in advice!

 

[Pong20302000]

maybe DSi Enhanced revisions

 

[syndrom3]

maybe DSi Enhanced revisions

I doubt because the DSi release are already included in the "old" numeration. The games included in "z" series are also new

 

[Pong20302000]

kk guys i can tell you

xxB1 = [BIOS] files
x000 = Kiosk Demos/ Demos / Distribution carts / Club Nintendo etc

 

[syndrom3]

kk guys i can tell you

xxB1 = [BIOS] files
x000 = Kiosk Demos/ Demos / Distribution carts / Club Nintendo etc

Yeah, I know these rules, my question is about:
z000 = ???
They are Retail games no kiosk or demos etc.

 

[Pong20302000]

z000 are older versions that are

Underdumped headers
Underdumped rom
Missing NDSi-specific data

 

[syndrom3]

z000 are older versions that are

Underdumped headers
Underdumped rom
Missing NDSi-specific data

Thank you!

 

[Foxi4]

Why the hell "z"? Wouldn't "d" as in "deprecated" or "n" as in "nuked" be better, more logical choices?