Fallout4

TES4

• New fields TNAM (two of). Seem to contain an int value and a list of Form IDs.

GLOB

• Seems identical to Skyrim.

GMST

• New EditorID prefix 'u', presumably used for unsigned int data types.

FLST

• New field FULL, presumably full localized name.

KYWD

• New field TNAM four bytes long unlikely a Form ID.
• New field NNAM that appears to be a short name (not localized).
• New field DNAM that appears to be a description (not localized).
• New field FULL, presumably full localized name.
• New field DATA four bytes contains a Form ID of an AORU form.

WTHR

• Field DATA may contain an additional byte.
• Field IMSP contains eight IMGS form IDs as opposed to four.
• Field FNAM contains 8, 14 or 18 floats.
• New field WGDR contains eight GDRY form IDs.
• New field GNAM contains a single LENS form ID.
• Days are now split into 8 parts as opposed to 4. This means there is twice as many Image Spaces, Colors, Alphas and so on. In addition to Dawn, Day, Dusk and Night, there are also 2 extra phases Early and Late for both Dawn and Dusk. Some WTHR records keep using the old four day scheme however.
• There is 19 weather color components as opposed to 17 in Skyrim. Some WTHR records still have only 17 color components however.

IMGS

• New field TX00 contains a LUT (Look Up Table) texture path.
• Field DNAM may contains 2 additional float values.

IMAD

• Field DNAM may contain 2 more size values, likely related to two new fields below.
• New Field optional NAM5 likely modifies one of the new fields in IMGS/DNAM.
• New Field optional NAM6 likely modifies one of the new fields in IMGS/DNAM.

LIGH

• Field DATA may contains up to 4 extra float values.
• New field NAM0 contains the path to a stencil (GOBO) texture.
• New field PRPS 8 bytes long. Only record "workshopLightbulbLight" has this field with value 39030000 0000803F possibly 825 (int) and 1 (float).
• New field PTRN contains a TRNS form ID.
• New field LNAM contains a LENS form ID.
• New field WGRD contains a GDRY form ID.
• Old field SNAM (holding sound) has not been seen in any record.

AMMO

• Field DATA contains Flags value only.
• Field ONAM contains a localized string (.strings)
• New field PTRN contains a TRNS form ID.
• New field DNAM 4 int/uint values. First value is a PROJ form ID. Second value looks like new flags. Third and fourth values are always 0.
• New field NAM1 contains casing model.
• New field NAM2 20 bytes long, tied to the presence of NAM1 possibly alternate textures.
• There does not appear to be ammo value and damage directly stored in this record

ALCH

• New field PTRN contains a TRNS form ID.
• New field CUSD contains a SNDR form ID. Possibly sound played when cooking / mixing.
• New field DNAM contains an int. Looks like a form ID but it is not.

TRNS

• New record, a few EditorID contains the word "transform". Something to do with transformation?
• Used in records: ALCH, AMMO, LIGH