#1003 7-zip cannot handle PKZIP 0.9 archives

[quanta]

Current release of 7-Zip is unable to extract ZIP archive created with 'Reduced' methods used by PKZIP 0.9x, which causes some old archives unusable in 7-zip, such as FANSI-Console[1][2]. As a comparison, PKUNZIP 2.50 is able to extract all files in the archive. Although they are legacy compression methods, such inability prevents old ZIP archives from being converted into new formats. For proper ZIP format support, 7-ZIP should support extraction of all ZIP methods.

The reduce methods were documented in APPNOTE.TXT, which was based on SCRNCH by Graeme McRae[3].

[1] http://cd.textfiles.com/microhaus/mhblackbox2/SCREEN/FC20HDOC.ZIP
[2] http://cd.textfiles.com/microhaus/mhblackbox2/SCREEN/FC20HPGM.ZIP
[3] PKZIP 0.90 review (1989-02-21), http://cd.textfiles.com/rbbsv3n1/pool/pkpolicy.zip

[Igor Pavlov]

OK. I'll try to implement it later.