When I launch BSP Viewer I get the following error message:
"The application failed to initialize properly (0xc0000135). Click ok to terminate the application."

BSP Viewer is written in C++ .NET and such as requires the .NET runtimes to run. See the downloads page for more information.

When I launch BSP Viewer I get the following error message:
"A required .DLL file, MSCOREE.DLL, was not found."

BSP Viewer is written in C++ .NET and such as requires the .NET runtimes to run. See the downloads page for more information.

Does BSP Viewer support Source .bsp files as well as Half-Life .bsp files?

No, BSP Viewer only supports Half-Life .bsp files.

How do I set BSP Viewer up?

To set BSP Viewer up:

1. Go to the Options menu and select Setup.
2. In the MOD field enter the name of the MOD you want to use BSP Viewer for (valve, cstrike, dod, ns, etc.).
3. In the User Path field select your Steam user path (..\Steam\SteamApps\you@yourhost.com).
4. Add all the packages your MOD uses (half-life.gcf should always be added).

Note: When you first run BSP Viewer, BSP Viewer will attempt to set itself up for Half-Life.

How do I save my edited entity data?

BSP Viewer does not yet support saving edited entity data. This does not, however, mean that it is not possible to update your .bsp with the changes you made. To update your .bsp with the new entity data simply export a .ent file from the File menu in BSP Viewer then import the .ent file back into your .bsp using Ripent. Ripent is part of Zoner's Tools.