.BGSM

.BGSM File Extension

Learn what a .bgsm file is, what it is used for, which programs can open it, and how to convert or troubleshoot this file format.

Data File Extension Guide 52 Searches
.BGSM
Bethesda Game Material File

Quick Facts

Basic information about this file format

Extension
.BGSM
File Type
Bethesda Game Material File
Category
Data
Best first step
Use compatible software

Quick Summary

A practical overview of the .bgsm file format

The BGSM (Bethesda Game Material) file format is a proprietary data file used extensively by games built on the Bethesda Creation Engine, notably Fallout 4, Skyrim Special Edition, and Starfield. These files are essential for defining the visual properties and rendering behavior of materials applie…

File extension .BGSM
File type Bethesda Game Material File
Category Data
Recommended action Open with a trusted compatible app

How to open a .bgsm file

Start with a trusted app that supports this format

  • Check the file extension carefully and confirm that the file name really ends with .bgsm.
  • Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
  • Update the application if the file was created by a newer version of the software.
  • Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.

What is a .bgsm file?

File extension details and usage information

The BGSM (Bethesda Game Material) file format is a proprietary data file used extensively by games built on the Bethesda Creation Engine, notably Fallout 4, Skyrim Special Edition, and Starfield. These files are essential for defining the visual properties and rendering behavior of materials applied to 3D models (NIF files) within the game world. A BGSM file does not contain the actual texture data (which is typically stored in DDS format) or the mesh geometry itself. Instead, it acts as a configuration file, specifying critical rendering parameters. These parameters include the paths to various texture maps (diffuse, normal, specular, environment maps), shader flags (e.g., transparency, glow, parallax, wetness), and specific color and intensity values (ambient, diffuse, specular colors). Modders and content creators rely heavily on BGSM files to customize the appearance of assets, ensuring that custom models integrate correctly and utilize the engine's advanced rendering features. They are crucial for achieving physically based rendering (PBR) effects within the game environment.

Software Compatibility

Programs that may open or work with .bgsm files

Windows

Compatible applications

Bethesda Creation Kit (Fallout 4/Skyrim SE/Starfield) Compatible
NifSkope Compatible
FO4 Material Editor (Third-party utility) Compatible
xEdit (SSEEdit/FO4Edit) Compatible

macOS

Compatible applications

NifSkope (via Wine/compatibility layer) Compatible

Linux

Compatible applications

NifSkope (via Wine/compatibility layer) Compatible

Mobile

Mobile applications

No specific software is listed for this platform yet. Try checking the file source, identifying the original application, or using a trusted universal file viewer when appropriate.

Can .bgsm files be converted?

Options for saving or exporting this file to another format

In many cases, a .bgsm file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.

  • Use the original software that created the file when possible.
  • Check whether the application supports exporting to common formats.
  • Be careful with online converters when working with private, business, or sensitive files.
  • If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .bgsm file.

Why can't I open a .bgsm file?

Common reasons this file type may not open correctly

Wrong software

The file may require a specific program that supports the .bgsm format.

Incorrect extension

The file extension may have been renamed manually, even though the actual file format is different.

Corrupted file

The file may be incomplete, damaged during download, or transferred incorrectly.

Outdated app

Your software may need to be updated before it can open newer versions of this file format.

Frequently Asked Questions

Common questions about .bgsm files

To open a .bgsm file, use software that supports this file format.

  • Bethesda Creation Kit (Fallout 4/Skyrim SE/Starfield)
  • NifSkope
  • FO4 Material Editor (Third-party utility)
  • xEdit (SSEEdit/FO4Edit)
  • NifSkope (via Wine/compatibility layer)

Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.

  1. Verify that the file extension is correct.
  2. Install or update compatible software.
  3. Try another application that supports this format.
  4. Check whether the file is corrupted, incomplete, or encrypted.

A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.

File safety tips

Use caution with unknown files

Only open files from trusted sources. Before opening a .bgsm file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.