"\215" (and basically every other byte ≥128) are being replaced with "\357\277\275". "\357\277\275" is the UTF-8 encoding of \x{FFFD}, the replacement character used to represent bad data. 
$ perl -MEncode -e'printf "%04X\n", ord decode "UTF-8", "\357\277\275"
+'
FFFD

[download]

It sounds like something tried to decode the zip file. 

$ perl -MEncode -we'print decode "UTF-8", "\215"' | od -c
Wide character in print at -e line 1.
0000000 357 277 275
0000003

[download]

While WWW::Mechanize's content calls decoded_content (defined in HTTP::Message), decoded_content shouldn't attempt to decode a zip file (only files with MIME type text/*).

Is the web server incorrectly saying the .zip is a UTF-8 text file? Could you provide the output of the following: 

print $mech->response()->headers()->as_string();

[download]

Delete "Set-Cookie:" headers and other authentication data before posting.

In reply to Re^5: Zip file from WWW::Mechanize by ikegami
in thread Zip file from WWW::Mechanize by jck000

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