unsupported compression method 98

[Craig]

Binary package hint: unzip

Using file-roller (or just unzip) to extract the attached archive, I get this error:

skipping: readme.txt unsupported compression method 98

The archive was made on Windows with Winzip.

According to http://www.pkware.com/documents/casestudies/APPNOTE.TXT :
98 - PPMd version I, Rev 1

There is a discussion about this type of compression at http://lists.samba.org/archive/linux/2009-May/023367.html

unzip is 5.52-12ubuntu1 from Jaunty.

[Rolf Leggewie (r0lf)]

I can confirm the failure in lucid file-roller (which uses unzip). Somebody else should say if this is a valid zip file or not.

confirming the ticket for the time being.

[Kazade (kazade)]

This bug affected me today, I received a "zipx" file. I can open it in File Roller, but any attempt to extract results in "PPMd method not supported" this is the same as compression method 98. There is some information about it here: http://www.winzip.com/comp_info.htm

I'm using Lucid AMD64.

[skorasaurus (skoraw)]

This bug still exists in unzip 6.0-4ubuntu1 (using 32bit, 12.04).

Attempting to extract a zip file that is compressed in this format results in a response " `PPMd' method not supported" and no files are extracted from the zip.

[skorasaurus (skoraw)]

FYI, the discussion linked in debian's report is broken, see: http://www.info-zip.org/phpBB3/viewtopic.php?f=4&t=113 instead.

[Dominik Viererbe (dviererbe)]

Bug is still present in 22.04, 22.10, 23.04 and in my merge candidate for 23.10
https://code.launchpad.net/~dviererbe/ubuntu/+source/unzip/+git/unzip/+merge/443804

$ wget https://bugs.launchpad.net/ubuntu/+source/unzip/+bug/393987/+attachment/617789/+files/readme.zip
$ unzip readme.zip
Archive: readme.zip
   skipping: readme.txt `PPMd' method not supported