ÿþ/ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \
I N T E L C O R P O R A T I O N P R O P R I E T A R Y I N F O R M A T I O N
T h i s s o f t w a r e i s s u p p l i e d u n d e r t h e t e r m s o f a l i c e n s e a g r e e m e n t o r
n o n d i s c l o s u r e a g r e e m e n t w i t h I n t e l C o r p o r a t i o n a n d m a y n o t b e c o p i e d o r
d i s c l o s e d e x c e p t i n a c c o r d a n c e w i t h t h e t e r m s o f t h a t a g r e e m e n t
C o p y r i g h t © 2 0 1 0 I n t e l C o r p o r a t i o n . A l l R i g h t s R e s e r v e d .
F i l e N a m e : i s s t r t c . i n f
D e s c r i p t i o n : A u d i o m i n i p o r t d r i v e r i n f f i l e
N o t e s :
\ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * /
[ V e r s i o n ]
S i g n a t u r e = " $ W i n d o w s N T $ "
C l a s s = M E D I A
P r o v i d e r = % I N T C %
C l a s s G U I D = { 4 d 3 6 e 9 6 c - e 3 2 5 - 1 1 c e - b f c 1 - 0 8 0 0 2 b e 1 0 3 1 8 }
D r i v e r V e r = 1 1 / 2 3 / 2 0 1 2 , 6 . 2 . 9 2 0 0 . 2 6 7 6 7
C a t a l o g F i l e = i s s t r t c . c a t
[ S o u r c e D i s k s N a m e s ]
2 2 2 = % I N T C D i s k % , " " , 2 2 2
[ S o u r c e D i s k s F i l e s ]
i s s t r t c . s y s = 2 2 2
r e a l t e k _ f w _ s s t . b i n = 2 2 2
; ; T h i s s y n t a x i s o n l y r e c o g n i z e d o n W i n d o w s X P a n d a b o v e - i t i s n e e d e d t o i n s t a l l 6 4 - b i t d r i v e r s o n
; ; W i n d o w s S e r v e r 2 0 0 3 S e r v i c e P a c k 1 a n d a b o v e .
[ M a n u f a c t u r e r ]
% M f g N a m e % = I n t e l S S T
; ; F o r W i n d o w s S e r v e r 2 0 0 3 S e r v i c e P a c k 1 a n d a b o v e , a 6 4 - b i t O S w i l l n o t i n s t a l l a d r i v e r
; ; u n l e s s t h e M a n u f a c t u r e r a n d M o d e l s S e c t i o n s e x p l i c i t l y s h o w i t i s a d r i v e r f o r t h a t p l a t f o r m
; ; B u t t h e i n d i v i d u a l m o d e l s e c t i o n d e c o r a t i o n s ( o r l a c k t h e r e o f ) w o r k a s t h e y a l w a y s h a v e .
; ; A l l o f t h e m o d e l s e c t i o n s r e f e r r e d t o a r e u n d e c o r a t e d o r N T - d e c o r a t e d , h e n c e w o r k o n a l l p l a t f o r m s
[ I n t e l S S T ]
% I n t e l S S T A u d i o . D e v i c e D e s c % = I n t e l S S T A u d i o , A C P I \ I N T C 3 3 B 3 ; H o w A C P I e n u m e r a t e S S T ?
[ D e s t i n a t i o n D i r s ]
I n t e l S S T A u d i o . C o p y L i s t = 1 0 , s y s t e m 3 2 \ d r i v e r s
[ I n t e l S S T A u d i o . C o p y L i s t ]
i s s t r t c . s y s
r e a l t e k _ f w _ s s t . b i n
[ I n t e l S S T A u d i o . A d d R e g ]
; * * * * * * D 0 / D 3 R T P M e n a b l i n g * * * * * *
H K R , P o w e r S e t t i n g s , C o n s e r v a t i o n I d l e T i m e , 0 x 0 0 0 1 0 0 0 1 , 0 x 1 e
H K R , P o w e r S e t t i n g s , P e r f o r m a n c e I d l e T i m e , 0 x 0 0 0 1 0 0 0 1 , 0 x 1 e
H K R , P o w e r S e t t i n g s , I d l e P o w e r S t a t e , 0 x 0 0 0 1 0 0 0 1 , 0 x 3
; * * * * * * B T S S P C o n f i g * * * * * *
H K R , B T S S P , B T S S P F R M S y n c M o d e , 0 x 0 0 0 1 0 0 0 1 , 0
H K R , B T S S P , B T S S P F R M P o l a r i t y , 0 x 0 0 0 1 0 0 0 1 , 1
H K R , B T S S P , B T S S P C l o c k M o d e , 0 x 0 0 0 1 0 0 0 1 , 0
; * * * * * * A u d i o V o l u m e / B o o s t C o n f i g * * * * * *
H K R , A u d i o V o l B o o s t , M i c M a x V o l u m e , 0 x 0 0 0 0 0 0 0 0 , 3 0
H K R , A u d i o V o l B o o s t , M i c M i n V o l u m e , 0 x 0 0 0 0 0 0 0 0 , - 1 8
H K R , A u d i o V o l B o o s t , M i c M a x B o o s t V o l u m e , 0 x 0 0 0 0 0 0 0 0 , 3 6
H K R , A u d i o V o l B o o s t , M i c M i n B o o s t V o l u m e , 0 x 0 0 0 0 0 0 0 0 , 0
H K R , A u d i o V o l B o o s t , S P K S t a r t U p V o l , 0 x 0 0 0 0 0 0 0 0 , - 6
H K R , A u d i o V o l B o o s t , S P K M a x V o l , 0 x 0 0 0 0 0 0 0 0 , 0
H K R , A u d i o V o l B o o s t , S P K M i n V o l , 0 x 0 0 0 0 0 0 0 0 , - 1 3 8
H K R , , A s s o c i a t e d F i l t e r s , , " w d m a u d , s w m i d i , r e d b o o k "
H K R , , D r i v e r , , i s s t r t c . s y s
H K R , D r i v e r s , S u b C l a s s e s , , " w a v e , m i d i , m i x e r "
H K R , D r i v e r s \ w a v e \ w d m a u d . d r v , D r i v e r , , w d m a u d . d r v
H K R , D r i v e r s \ m i d i \ w d m a u d . d r v , D r i v e r , , w d m a u d . d r v
H K R , D r i v e r s \ m i x e r \ w d m a u d . d r v , D r i v e r , , w d m a u d . d r v
H K R , D r i v e r s \ w a v e \ w d m a u d . d r v , D e s c r i p t i o n , , % I n t e l S S T A u d i o . D e v i c e D e s c %
H K R , D r i v e r s \ m i d i \ w d m a u d . d r v , D e s c r i p t i o n , , % I n t e l S S T A u d i o _ M I D I %
H K R , D r i v e r s \ m i x e r \ w d m a u d . d r v , D e s c r i p t i o n , , % I n t e l S S T A u d i o . D e v i c e D e s c %
H K L M , % M e d i a C a t e g o r i e s % \ % I n t e l S S T . N a m e G u i d % , N a m e , , % I n t e l S S T . N a m e %
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
; i n t e r f a c e s
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
; * * * * * * * * * H E A D S E T * * * * * * * * * * * * * * * * *
[ I n t e l S S T . I . W a v e ]
A d d R e g = I n t e l S S T . I . W a v e . A d d R e g
[ I n t e l S S T . I . W a v e . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . W a v e . s z P n a m e %
[ I n t e l S S T . I . T o p o ]
A d d R e g = I n t e l S S T . I . T o p o . A d d R e g
[ I n t e l S S T . I . T o p o . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . T o p o . s z P n a m e %
; o p t - i n t o p u l l m o d e .
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n % , , % K S N O D E T Y P E _ A N Y %
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e % , 0 x 0 0 0 1 0 0 0 1 , 0 x 1
H K R , " E P \ \ 1 " , % P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n % , , % K S N O D E T Y P E _ A N Y %
H K R , " E P \ \ 1 " , % P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e % , 0 x 0 0 0 1 0 0 0 1 , 0 x 1
; * * * * * * * * * I H F * * * * * * * * * * * * * * * * *
[ I n t e l S S T . I . W a v e I H F ]
A d d R e g = I n t e l S S T . I . W a v e I H F . A d d R e g
[ I n t e l S S T . I . W a v e I H F . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . W a v e I H F . s z P n a m e %
[ I n t e l S S T . I . T o p o I H F ]
A d d R e g = I n t e l S S T . I . T o p o I H F . A d d R e g
[ I n t e l S S T . I . T o p o I H F . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . T o p o I H F . s z P n a m e %
; o p t - i n t o p u l l m o d e .
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n % , , % K S N O D E T Y P E _ A N Y %
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e % , 0 x 0 0 0 1 0 0 0 1 , 0 x 1
; * * * * * * * * * D M I C * * * * * * * * * * * * * * * * *
[ I n t e l S S T . I . W a v e D M I C ]
A d d R e g = I n t e l S S T . I . W a v e D M I C . A d d R e g
[ I n t e l S S T . I . W a v e D M I C . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . W a v e D M I C . s z P n a m e %
[ I n t e l S S T . I . T o p o D M I C ]
A d d R e g = I n t e l S S T . I . T o p o D M I C . A d d R e g
[ I n t e l S S T . I . T o p o D M I C . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . T o p o D M I C . s z P n a m e %
; o p t - i n t o p u l l m o d e .
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n % , , % K S N O D E T Y P E _ A N Y %
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e % , 0 x 0 0 0 1 0 0 0 1 , 0 x 1
; * * * * * * * * * H D M I * * * * * * * * * * * * * * * * *
[ I n t e l S S T . I . W a v e H d m i ]
A d d R e g = I n t e l S S T . I . W a v e H d m i . A d d R e g
[ I n t e l S S T . I . W a v e H d m i . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . W a v e H d m i . s z P n a m e %
[ I n t e l S S T . I . T o p o H d m i ]
A d d R e g = I n t e l S S T . I . T o p o H d m i . A d d R e g
[ I n t e l S S T . I . T o p o H d m i . A d d R e g ]
H K R , , C L S I D , , % P r o x y . C L S I D %
H K R , , F r i e n d l y N a m e , , % I n t e l S S T . T o p o H d m i . s z P n a m e %
; o p t - i n t o p u l l m o d e .
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n % , , % K S N O D E T Y P E _ A N Y %
H K R , " E P \ \ 0 " , % P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e % , 0 x 0 0 0 1 0 0 0 1 , 0 x 1
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
; I n t e l S S T A u d i o
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
[ I n t e l S S T A u d i o . N T ]
I n c l u d e = k s . i n f , w d m a u d i o . i n f
N e e d s = K S . R e g i s t r a t i o n , W D M A U D I O . R e g i s t r a t i o n
C o p y F i l e s = I n t e l S S T A u d i o . C o p y L i s t
A d d R e g = I n t e l S S T A u d i o . A d d R e g
R e b o o t
[ I n t e l S S T A u d i o . N T . I n t e r f a c e s ]
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ W a v e % , I n t e l S S T . I . W a v e
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E N D E R % , % K S N A M E _ W a v e % , I n t e l S S T . I . W a v e
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E A L T I M E % , % K S N A M E _ W a v e % , I n t e l S S T . I . W a v e
A d d I n t e r f a c e = % K S C A T E G O R Y _ C A P T U R E % , % K S N A M E _ W a v e % , I n t e l S S T . I . W a v e
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ T o p o l o g y % , I n t e l S S T . I . T o p o
A d d I n t e r f a c e = % K S C A T E G O R Y _ T O P O L O G Y % , % K S N A M E _ T o p o l o g y % , I n t e l S S T . I . T o p o
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ W a v e I H F % , I n t e l S S T . I . W a v e I H F
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E N D E R % , % K S N A M E _ W a v e I H F % , I n t e l S S T . I . W a v e I H F
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E A L T I M E % , % K S N A M E _ W a v e I H F % , I n t e l S S T . I . W a v e I H F
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ T o p o l o g y I H F % , I n t e l S S T . I . T o p o I H F
A d d I n t e r f a c e = % K S C A T E G O R Y _ T O P O L O G Y % , % K S N A M E _ T o p o l o g y I H F % , I n t e l S S T . I . T o p o I H F
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ W a v e D M I C % , I n t e l S S T . I . W a v e D M I C
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E A L T I M E % , % K S N A M E _ W a v e D M I C % , I n t e l S S T . I . W a v e D M I C
A d d I n t e r f a c e = % K S C A T E G O R Y _ C A P T U R E % , % K S N A M E _ W a v e D M I C % , I n t e l S S T . I . W a v e D M I C
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ T o p o l o g y D M I C % , I n t e l S S T . I . T o p o D M I C
A d d I n t e r f a c e = % K S C A T E G O R Y _ T O P O L O G Y % , % K S N A M E _ T o p o l o g y D M I C % , I n t e l S S T . I . T o p o D M I C
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ W a v e H d m i % , I n t e l S S T . I . W a v e H d m i
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E N D E R % , % K S N A M E _ W a v e H d m i % , I n t e l S S T . I . W a v e H d m i
A d d I n t e r f a c e = % K S C A T E G O R Y _ R E A L T I M E % , % K S N A M E _ W a v e H d m i % , I n t e l S S T . I . W a v e H d m i
A d d I n t e r f a c e = % K S C A T E G O R Y _ A U D I O % , % K S N A M E _ T o p o l o g y H d m i % , I n t e l S S T . I . T o p o H d m i
A d d I n t e r f a c e = % K S C A T E G O R Y _ T O P O L O G Y % , % K S N A M E _ T o p o l o g y H d m i % , I n t e l S S T . I . T o p o H d m i
[ I n t e l S S T A u d i o . N T . S e r v i c e s ]
A d d S e r v i c e = I n t e l S S T , 0 x 0 0 0 0 0 0 0 2 , I n t e l S S T _ A u d i o _ S e r v i c e _ I n s t
[ I n t e l S S T _ A u d i o _ S e r v i c e _ I n s t ]
D i s p l a y N a m e = % I n t e l S S T _ A u d i o . S v c D e s c %
S e r v i c e T y p e = 1
S t a r t T y p e = 3
E r r o r C o n t r o l = 1
S e r v i c e B i n a r y = % 1 0 % \ s y s t e m 3 2 \ d r i v e r s \ i s s t r t c . s y s
[ I n t e l S S T A u d i o . N T . H W ]
A d d R e g = A U D I O H W . A d d R e g
[ A U D I O H W . A d d R e g ]
; F I L E _ D E V I C E _ S O U N D
H K R , , D e v i c e T y p e , 0 x 1 0 0 0 1 , 0 x 0 0 0 0 0 0 1 D
; S D D L _ D E V O B J _ S Y S _ A L L _ A D M _ R W X _ W O R L D _ R W X _ R E S _ R W X
H K R , , S e c u r i t y , , " D : P ( A ; ; G A ; ; ; S Y ) ( A ; ; G R G W G X ; ; ; B A ) ( A ; ; G R G W G X ; ; ; W D ) ( A ; ; G R G W G X ; ; ; R C ) "
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
; C O M M O N
; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
[ S t r i n g s ]
I N T C = " I n t e l "
M f g N a m e = " I n t e l C o r p o r a t i o n "
I n t e l S S T A u d i o . D e v i c e D e s c = " I n t e l S S T A u d i o D e v i c e ( W D M ) "
I n t e l S S T . W a v e . s z P n a m e = " I n t e l S S T A u d i o W a v e f o r H S "
I n t e l S S T . T o p o . s z P n a m e = " I n t e l S S T A u d i o T o p o l o g y f o r H S "
I n t e l S S T . W a v e I H F . s z P n a m e = " I n t e l S S T A u d i o W a v e f o r I H F "
I n t e l S S T . T o p o I H F . s z P n a m e = " I n t e l S S T A u d i o T o p o l o g y f o r I H F "
I n t e l S S T . W a v e D M I C . s z P n a m e = " I n t e l S S T A u d i o W a v e f o r D M I C "
I n t e l S S T . T o p o D M I C . s z P n a m e = " I n t e l S S T A u d i o T o p o l o g y f o r D M I C "
I n t e l S S T . W a v e H d m i . s z P n a m e = " I n t e l S S T A u d i o W a v e f o r H d m i "
I n t e l S S T . T o p o H d m i . s z P n a m e = " I n t e l S S T A u d i o T o p o l o g y f o r H d m i "
I N T C D i s k = " I n t e l S S T D r i v e r D i s k "
P r o x y . C L S I D = " { 1 7 C C A 7 1 B - E C D 7 - 1 1 D 0 - B 9 0 8 - 0 0 A 0 C 9 2 2 3 1 9 6 } "
K S C A T E G O R Y _ A U D I O = " { 6 9 9 4 A D 0 4 - 9 3 E F - 1 1 D 0 - A 3 C C - 0 0 A 0 C 9 2 2 3 1 9 6 } "
K S C A T E G O R Y _ R E N D E R = " { 6 5 E 8 7 7 3 E - 8 F 5 6 - 1 1 D 0 - A 3 B 9 - 0 0 A 0 C 9 2 2 3 1 9 6 } "
K S C A T E G O R Y _ C A P T U R E = " { 6 5 E 8 7 7 3 D - 8 F 5 6 - 1 1 D 0 - A 3 B 9 - 0 0 A 0 C 9 2 2 3 1 9 6 } "
K S C A T E G O R Y _ R E A L T I M E = " { E B 1 1 5 F F C - 1 0 C 8 - 4 9 6 4 - 8 3 1 D - 6 D C B 0 2 E 6 F 2 3 F } " ; n o n - l o c a l i z a b l e
K S C A T E G O R Y _ T O P O L O G Y = " { D D A 5 4 A 4 0 - 1 E 4 C - 1 1 D 1 - A 0 5 0 - 4 0 5 7 0 5 C 1 0 0 0 0 } " ; n o n - l o c a l i z a b l e
K S N A M E _ W a v e = " W a v e "
K S N A M E _ T o p o l o g y = " T o p o l o g y "
K S N A M E _ W a v e I H F = " W a v e I H F "
K S N A M E _ T o p o l o g y I H F = " T o p o l o g y I H F "
K S N A M E _ W a v e D M I C = " W a v e D M I C "
K S N A M E _ T o p o l o g y D M I C = " T o p o l o g y D M I C "
K S N A M E _ W a v e H d m i = " W a v e H d m i "
K S N A M E _ T o p o l o g y H d m i = " T o p o H d m i "
I n t e l S S T _ A u d i o . S v c D e s c = " I n t e l S S T A u d i o D e v i c e ( W D M ) "
I n t e l S S T A u d i o _ M I D I = " I n t e l S S T A u d i o M I D I D e v i c e ( W D M ) "
M e d i a C a t e g o r i e s = " S Y S T E M \ C u r r e n t C o n t r o l S e t \ C o n t r o l \ M e d i a C a t e g o r i e s "
I n t e l S S T . N a m e G u i d = " { 9 4 6 A 7 B 1 A - E B B C - 4 2 2 a - A 8 1 F - E 0 7 C 8 D 4 0 D 3 B 4 } "
I n t e l S S T . N a m e = " I n t e l S S T "
K S N O D E T Y P E _ A N Y = " { 0 0 0 0 0 0 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 0 0 - 0 0 0 0 0 0 0 0 0 0 0 0 } "
P K E Y _ A u d i o E n d p o i n t _ A s s o c i a t i o n = " { 1 D A 5 D 8 0 3 - D 4 9 2 - 4 E D D - 8 C 2 3 - E 0 C 0 F F E E 7 F 0 E } , 2 "
P K E Y _ A u d i o E n d p o i n t _ S u p p o r t s _ E v e n t D r i v e n _ M o d e = " { 1 D A 5 D 8 0 3 - D 4 9 2 - 4 E D D - 8 C 2 3 - E 0 C 0 F F E E 7 F 0 E } , 7 "
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.