On Wed, 23 May 2018 16:57:18 +0000, Pew, Curtis G wrote: >> >> Why didn't the supplier, as a courtesy to the customer, deliver the file with >> the needed extension and save that step? > >This is just a guess, but maybe some firewalls or other policy enforcing >software block .jar files but allow .zip files. If you have a Java VM on your >system, .jar files contain executable code and in some circumstances might be >executed inadvertently. > And other firewalls block .zip instead (or also). After all, a .zip might contain anything, including executable code. Some firewalls have a whitelist. And I dealt recently with one that blocked a .eml (Forward as Attachment).
MIME-encode it; strip headers; name it *.txt. or wrap it as *.pdf. But don't rely on a filename as defense against malware. See: "steganography". -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
