DOS - Services Summary - File Operations

Common use:
Description					      Version	 Function
----------------------------------------------------- ---------- -----------
File Create (DOS type)						 Int\21f\5B
File Open  (return file handle) 				 Int\21f\3D
File Pointer Move (read-write pointer)				 Int\21f\42
File Read							 Int\21f\3F
File Write                (file specified by file handle)        Int\21f\40
File Close							 Int\21f\3E
File Rename                                                      Int\21f\56
File Delete							 Int\21f\41
File parse pathname 						 Int\21f\60

Description					      Version	 Function
----------------------------------------------------- ---------- -----------
File Attribute Set/Get						 Int\21f\43
File Close (FCB)						 Int\21f\10
File Close							 Int\21f\3E
File Commit					      (DOS 3.3)  Int\21f\68
File Create (DOS type)						 Int\21f\5B
File Create (extended)				      (DOS 4.0)  (Int\21f\6C)
File Create (with a unique filename)				 Int\21f\5A
File Date Get/Set                                                Int\21f\57
File Delete (FCB)						 Int\21f\13
File Delete							 Int\21f\41
File Directory Entry Find Matching First                         Int\21f\11
File Directory Entry Find Matching Next                          Int\21f\12
File Directory Entry Find or Create                              Int\21f\16
File Find Matching First                                         Int\21f\4E
File Find Matching Next                                          Int\21f\4F
File Handle Count Set				      (DOS 3.3)  Int\21f\67
File Handle Create and Return                                    Int\21f\3C
File Handle Duplicate                                            Int\21f\45
File Handle Duplicate (force)                                    Int\21f\46
File Load or Execute (program file)                              Int\21f\4B
File Lock                                                        Int\21f\5C
File Name Parse (from the command line)                          Int\21f\29
File Open (FCB) 						 Int\21f\0F
File Open  (return file handle) 				 Int\21f\3D
File Open   (extended)				      (DOS 4.0)  (Int\21f\6C)
File Pointer Move (read-write pointer)				 Int\21f\42
File Read							 Int\21f\3F
File Read Random (FCB)						 Int\21f\21
File Read Random Block (FCB)					 Int\21f\27
File Read Sequential (FCB)					 Int\21f\14
File Record Count Return (FCB)					 Int\21f\23
File Record Size Set (FCB)					 Int\21f\24
File Rename                                                      Int\21f\56
File Rename (FCB)						 Int\21f\17
File Time Get/Set                                                Int\21f\57
File Unlock                                                      Int\21f\5C
File Write                (file specified by file handle)        Int\21f\40
File Write Random         (file specified by File Control Block) Int\21f\22
File Write Random Block   (file specified by File Control Block) Int\21f\28
File Write Sequential     (file specified by File Control Block) Int\21f\14
 Int\21f\29	parse the command line for file name 
 Int\21f\60*	parse pathname