PHYS
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.phys files are [Chunk|chunked]. The files are used by Blizzard's Domino physics engine which got added to WoW in the fourth expansion (MoP). In build 15464, there is one .phys file "item/objectcomponents/waist/buckle_panstart_a_01.phys". .phys files are an extension to M2s.
The main PHYS chunk is followed by an unordered sequence of unique chunks of the other types.
// vec*: * floats // mat*x*: * times * floats.
PHYS
short must_be_null; // PhysData::Load fails otherwise. (if (phys->token != 'PHYS' || phys->must_be_null) return false;)
BOXS
struct BOXSEntry { mat3x3 a; vec3 b; vec3 c; } boxShapes[];
CAPS
struct CAPSEntry { int a; int b; int c; vec4 d; } capsuleShapes[];
SHAP
struct SHAPEntry { short a; short b; int c; float d; int e; float f; } shapes[];
BODY
struct BODYEntry { int a; int b; int c; int d; short e; short f; int g; int h; } bodies[];
WELJ
struct WELJEntry { mat3x3 matrix; vec3 a; mat3x3 matrix2; vec3 a2; vec2 b; } weldJoins[];
JOIN
struct JOINEntry { int a; int b; int c; short d; short e; } joins[];
SPHJ
struct SPHJEntry { char a[0x1C]; } entries[];
SPHS
struct SPHSEntry { char a[0x10]; } sphereShapes[];
SHOJ
struct SHOJEntry { char a[0x6C]; } shoulderJoints[];