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Version: 2026.2

Papyrus namespaces

Description​

Fallout 4 and Starfield let a script declare a namespace in its header:

Scriptname MyMod01:MyScript extends Quest

The namespace is the part before the last colon, MyMod01 here. It maps to a folder: the script lives in MyMod01\MyScript.psc, and its compiled form belongs in MyMod01\MyScript.pex.

PCA reads that header and handles it for you:

  • the namespace is passed to the compiler along with the script name;
  • the namespace root folder is imported, not the folder the script sits in;
  • the .pex is written into its namespace subfolder of the output folder.

Nothing to configure. Skyrim has no namespaces and is unaffected.

Fallout 4 imports​

PCA imports the three roots the game actually uses:

  • Scripts\Source
  • Scripts\Source\Base
  • Scripts\Source\User

Their subfolders are namespace folders, not import roots — the compiler walks down to them on its own, so PCA does not pass them.

Keeping the list this short is also what keeps the compiler command line well under the Windows length limit.

Starfield imports​

Starfield keeps every script under Scripts\Source, and its subfolders are namespaces, so that folder is the only import root.