A VEG file works as a non-destructive project outline used by VEGAS Pro to capture editing choices without embedding any video or audio, relying instead on references to the original media plus metadata and every adjustment made on the timeline, which keeps the file small and dependent on accessible source files; when loaded, VEGAS Pro recreates the timeline if those files exist but reports missing ones otherwise, and real output isn’t produced until the user renders the project.

Rendering is the only moment when VEGAS Pro creates an actual video file, because during export it reads the source clips, applies all instructions from the VEG file, and writes a new format like MP4 or MOV, while deleting the VEG file does not touch the original media but does erase the ability to reopen or change the project, making VEG files more like editable blueprints than finished videos, since rendering and project files serve different roles and the VEG file itself cannot act as a video, as it simply tells VEGAS Pro how to assemble the footage for preview without producing real frames until export.

Rendering is the point at which VEGAS Pro turns instructions into a complete video, as the program processes source media frame by frame, applies every listed cut, transition, effect, and audio process, and then encodes the result into MP4, MOV, or AVI, yielding a self-contained file independent of project paths, while the VEG file remains editable but not usable as final output, and deleting it destroys the ability to change the video even though the render survives, whereas deleting the render still allows re-exporting if the VEG and clips remain, highlighting the VEG file as the master and rendering as the final transformation step.

When VEGAS Pro loads a VEG file, it loads the descriptive project structure, which outlines how the editing session was last arranged, bypassing any direct media import as it identifies tracks, clip timing, effects, and settings, then attempts to locate every referenced source file to reconstruct the project, notifying you if anything has been moved or renamed because the VEG file contains only instructions, not the media itself.

After the media is located, VEGAS Pro forms a live preview by applying instructions instantly, merging source footage with effects, transitions, color fixes, and audio tweaks as you play the project, depending on system power and never generating a finished video, keeping the project fully editable and restoring the workspace rather than creating a deliverable until you perform a final render.