The WEAVE3.EXE file is a DOS executable meant for running .ZZT files only.  Create .ZZT files using the provided LOOM and ZLOOM2 editors; installers for many platforms included. The only emulation provided is for HTML5; if you want desktop emulation, visit https://zeta.asie.pl/, and if you want to check out other ZZT files go to https://museumofzzt.com/.  If you want to use Weave with Zeta, rename WEAVE3.EXE to ZZT.EXE in the directory where you emulate your game.