Bethesda Modding Wiki

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//This reference was written for Fallout 4 and may be only partially applicable to other games.//
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**This page is under construction.**
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==== Archives (BA2) ====
There are two archive formats and each has it's own limit. \\
//The total number of archives is not relevant to the limit.//
  * **General:** 256 — Exceeding this results in a crash at the main menu.
  * **Texture:** 255 — Exceeding this causes the game to load the wrong textures for objects.
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There is currently no bug-free way to increase these limits. \\
Mods that attempt to increase the limit should have those options disabled.
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==== Modules (ESM/ESL/ESP) ====
There are two types of modules (also known as plugins): **Full** and **Light**. \\
Any module with the ''.esl'' file name extension or the ''ESL'' flag set in its file header is a Light Module. \\
//This can include ''.esm'' and ''.esp'' files.// \\
All other modules (i.e. ''.esm'' and ''.esp'' //without// the ''ESL'' flag) are Full Modules.
  * **Full:** 254
  * **Light:** 4096


==== Form ID Range ====
Fallout 4 supports two Module HEDR versions: **0.95** & **1.00**. \\
With v1.00 the maximum number of **new records** was increased by allowing use of Form IDs in the extended range, doubling the capacity for new records in ''ESL''-flagged files. \\
In v0.95, Form IDs in the extended range were treated as overrides of hard-coded records in ''Fallout4.exe''. \\
//Overrides of records from other modules do not contribute to this limit.//
  * **Extended Range:** 001-7FF (2047 IDs; 000 is the TES4 Header Record)
  * **Light Module v0.95:** 800-FFF — 2048 New Records
  * **Light Module v1.00:** 001-FFF — 4095 New Records
  * **Full Module v0.95:** 800-FFF — 16,775,168 New Records
  * **Full Module v1.00:** 001-FFF — 16,777,215 New Records

==== Reference Handles ====
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**This section under construction.**
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==== Open File Handles ====
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**This section under construction.**
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