OBJFIX by HP.

When a binary object received by Kermit on the HP-48 is
left as a string beginning with HPHP48, OBJFIX will
extract the HP-48 object if the only problem is that
extra bytes got appended to the end.

OBJFIX takes a variable name in stack level 1 and
modifies the contents of the variable if no other
problems are detected.

[Note: This is like FIXIT by Horn & Heiskanen on Goodies
 Disk #8, but this one is by HP and so I suppose it's
 more reliable. Although it fails the test cases
 included with FIXIT, that may be because they were
 artifically contrived cases. Try both on real-world
 downloads that need fixing. Which do you like better?
 -jkh-]