# Audio File Extensions

<p class="callout info">These are the audio file types you will be interacting with.</p>

##### **.ogg**

Extracted music files from "**music**", "**music\_patch\_1**", &amp; **"music\_patch\_2"** will be converted to this format if they are to be edited.  
OGG files **CANNOT** be re-injected into DOOM Eternal.  
<span style="text-decoration: underline;">Example:</span>  
`<strong>cultist_base_music_main_heavy_0_id#156134790.ogg</strong>`

##### **.opus**

Extracted sound effect &amp; voice over files from "**sfx**", "**sfx\_patch\_1**", "**vo\_English(US)**", etc will be in this format.  
OPUS files **CAN** be re-injected into DOOM Eternal.  
<span style="text-decoration: underline;">Example:</span>  
`<strong>ammo_bfg_id#373311939.opus</strong>`

##### **.wav**

Edited music files must be converted into the WAV format before they can be converted into WEM files.  
WAV files **CANNOT** be re-injected into DOOM Eternal as music files, but they **CAN** as sound effects &amp; voice overs.  
<span style="text-decoration: underline;">Example:</span>  
`<strong>cultist_base_music_main_heavy_0_id#156134790.wav</strong>`

##### **.wem**

After the edited music files have been converted into the WEM format, they **CAN** be re-injected into DOOM Eternal.  
<span style="text-decoration: underline;">Example:</span>  
`<strong>cultist_base_music_main_heavy_0_id#156134790.wem</strong>`

##### **.snd**

These contain the audio files. They **CANNOT** be directly modified by a conventional audio editor.  
Instead, tools are used to extract individual audio audio files.  
<span style="text-decoration: underline;">Example:</span>  
**`music.snd`**

##### **.pck**

These contain the audio resources. They **CANNOT** be directly modified by a conventional audio editor.  
However, [Fusion Tools](https://wiki.eternalmods.com/books/beginners-guide-how-to-create-mods/page/sound-length-advanced-guide) can directly modify PCK files.  
<span style="text-decoration: underline;">Example:  
</span>`<strong>mus.pck</strong>`<span style="text-decoration: underline;">  
</span>

<p class="callout warning">If a **WEM** file has been exported correctly (Vorbis Quality High), they should have "**\_3F75BDB9**" before its WEM extension. You will need to delete the "**\_3F75BDB9**" in the WEM file's name before you can inject it into DOOM Eternal.</p>

<p class="callout danger">**PCK** files modified by [Fusion Tools](https://www.nexusmods.com/doometernal/mods/688) are not supported by [DEternal\_loadMods](https://github.com/dcealopez/EternalModLoader),   
which is a program that allows certain mods type to be injected.</p>

<p class="callout info">See [Creating Audio Mods](https://wiki.eternalmods.com/books/beginners-guide-how-to-create-mods/page/creating-sound-mods) for more information.</p>