Int 2F Fn 1704  - MS Windows "winoldap" - Get Clipboard Data Size          [W]

   AX = 1704h
   DX = clipboard format supported by WinOldAp (see AX=1703h)

Return:     DX:AX = size of data in bytes, including any headers
Failure: DX:AX = 0  no data in this format in the Clipboard