File skipped unknown compression method

[Guest]

We are being sent numerous ZIP files from a vendor that contain simple text
files. These files are also password protected within the ZIP but extracting
them causes the following error: "File skipped unknown compression method"

The ZIP file can be extracted with WinZip, but we're not licensed for it so
I wanted to try and figure out how we can get it to work with XPs integrated
compression untility. Any help would be appreciated. Thanks. --Andrew

 

[Tom Porterfield]

We are being sent numerous ZIP files from a vendor that contain simple text
files. These files are also password protected within the ZIP but extracting
them causes the following error: "File skipped unknown compression method"

The ZIP file can be extracted with WinZip, but we're not licensed for it so
I wanted to try and figure out how we can get it to work with XPs integrated
compression untility. Any help would be appreciated. Thanks. --Andrew

Possibly they are using WinZip's new enhanced compression method. XP's
built in zip folders doesn't understand this enhanced method. Can you
ask that the vendor use WinZip's portable compression, which is
understood by XP as well as other standard zip programs?
--
Tom Porterfield
MS-MVP Windows
http://support.teloep.org

Please post all follow-ups to the newsgroup only.

 

[Plato]

Tell them to send you standard .zip files that are not password
protected.

 

[Bindar Dundat]

The person that is compressing the files is probably using something like 7Zip.
That program and probably others are capable of creating ZIP files using several
algorithms. If they are using deflate 64 to get maximum compression (or even
deflate32) then the Win XP compression utility will not read them. You could
either have them compress the files using standard ZIP format. In the case of
7Zip that can be done by not using the -t switch. The alternative is for you to
download 7Zip (Free) and use that instead of the XP program.
http://www.7-zip.org/

--
Bindar Dundat©
| We are being sent numerous ZIP files from a vendor that contain simple text
| files. These files are also password protected within the ZIP but extracting
| them causes the following error: "File skipped unknown compression method"
|
| The ZIP file can be extracted with WinZip, but we're not licensed for it so
| I wanted to try and figure out how we can get it to work with XPs integrated
| compression untility. Any help would be appreciated. Thanks. --Andrew