expressions - In anything but....meaning and usage

I am reading some documentation and cannot fully understand the meaning of 'In anything but..'

In anything but the smallest applications it makes sense to organize the service
definitions by moving them into one or more configuration files.

I have already read "However, this book is anything but" meaning, but it seems different to me. What do you think?

Answer

In anything but the smallest applications it makes sense to organize

The word but can mean except or other than.

but

conjunction

conjunction: but

2.

used to indicate the impossibility of anything other than what is

being stated. "one cannot but sympathize"

synonyms: (do) other than, otherwise than, except "one cannot but
sympathize"

https://www.google.co.uk/search?q=but+definition&ie=&oe=
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In anything other than the smallest applications it makes sense to organize

This means,

It makes sense to organize in all applications that are not very small.