The Lmp Fiddler Version 1.0

By Ryan Robinson (robinson@aros.net)

Description: Lets you modify The lmp headers to change
      -Game Version 
      -Skill
      -Episode
      -Map Number
      -Mode (Deathmatch, Altdeath, Co-op)
      -Respawn
      -Fast
      -Nomonsters
      -Viewpoint
      -Which players are present

Now displays demo length (in real time!) :)

The only problem is, changing most of this stuff will just make you look
like an idiot, getting your but kicked, shooting at nothing, running into  
walls, that sort of thing. :(
A note about converting versions: 
This utility can convert between 1.4 - 1.9 just fine, and converting 1.1 to
1.2 (why would you want to do that anyway?) is not necessary because they
are already compatible! :) 
Converting pre/post 1.4:
With this you can convert between pre and post 1.4, but you have to be 
careful because doom will barf if you try to convert multiplayer demos.
All other levels (except deathmatch in 1.2 - doesn't use dm starts! :( )
should work fine, except little changes in the lmp format cause it to
gradually become unsynchronized, and then your guy goes crazy. :[

But at least the viewpoint changer, time display, and 1.4 - 1.9 conversion
works! ;)

Careful!  No error checking!  ;) 
Special thanks to: Matthew S. Fell for the Unofficial Doom Specs

Where to get this file:
ftp.cdrom.com/idgames and others