PB里如何建立文件？

[土著巫师]

我查了PB所有有文件操作函数，没发现文件建立函数！
ChangeDirectory Change directory
CreateDirectory Create a directory
DirectoryExists Determine if a named directory exists
FileClose Close a file
FileCopy Copy a file
FileDelete Delete a file
FileExists Determine whether a file exists
FileLength Obtain the length of a file
FileMove Move a file
FileOpen Open a file
FileRead Read a file
FileSeek Seek to a position in a file
FileWrite Write to a file.
GetCurrentDirectory Get the name of the current directory
GetFileOpenName Display Open File dialog.
GetFileSaveName Display Save File dialog.
RemoveDirectory Remove a directory
是直接调用WINDOWS API函数CreateFile(...)吗？真搞不明白SYBASE为什么要这样做？

[polugen]

FileOpen ( filename {, filemode {, fileaccess {, filelock {, writemode { creator, filetype }}}}} )
其中
fileaccess (optional) A value of the FileAccess enumerated type that specifies whether the file is opened for reading or writing. Values are:?Read! ?(Default) Read-only access?Write! ?Write-only accessIf PowerBuilder doesn't find the file, a new file is created if the fileaccess argument is set to Write!