XTREE (Gold) is *still* one of the most powerful PC management tools.
Its viewer lets you byte-edit files of any length (in HEX mode only),
but you can't change file lengths anyway.

  Adriano De Minicis wrote:

>    4a) the editor must be capable of loading files bigger
>        than 64kB (Notepad can't, a good freeware editor is
>        EmEditor). For extra caution, I make sure not to vary
>        the length of file (overwrite the line, don't insert
>        characters). Variyng the length may cause problems if
>        messages are indexed, and I don't want to mess-up my mailbox.

  If I *do* vary the length of a file in editing, I make a point of
deleting the corresponding index (SNM) file before pointing Netscape
back to the file, just in case.  I'm not sure if it's essential, but I
haven't had any blunders.

  The one blunder I *did* have, was last weekend and trashed my whole
Inbox.  This was however due to running out of disk space; I had *only*
allocated 548Mb to my Internet partition.  Anyone to whom I should have
replied last weekend, that's why I haven't (contained months of un-
answered messages, about 4Mb)!
--
  Cheers,
        Paul B.