How to play demos:

1. QuakeWorld Demos
Quakeworld demos end with the extension .QWD. They will not play in normal Quake. To play TF demos from Quakeworld client do this:
1) Connect to a TF server
2) In console type:( playdemo NAME )
Replace name with the name of the demo filename, but do not add the .qwd to it.
3) Watch the demo!

2. Quake Demos
Playing Quake demos is easy!
1) Start Quake like this: ( Quake +game fortress )
2) In console type:( playdemo NAME )
3) Watch the demo!)