#2 Absolutely necessary!

[Anonymous]

According to the 7-zip documentation, there is a 4GB
dictionary limit for LZMA compression!

7-zip, a 32-bit x86 program, obviously cannot create
archives with such a large dictionary, only decompress
them.

So p7zip MUST create them!

[my space]

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p7zip is a port of 7-zip.

the aim of p7zip is not to create an incompatible 7z archive.

Moreover, I am not sure that "bigger dictionnary than 4GB"
really means lower compression ratio ...

So why is absolutely necessary to have dictionnary bigger
than 4GB ?