867c4b58_VB_Net___Modifiers__Modifier
[S.N] 4 [Description] The charsetmodifier part in the Declare statement supplies the character set information for marshaling strings during a call to the external procedure. It also affects how Visual Basic searches the external file for the external procedure name. The Auto modifier specifies that Visual Basic should marshal strings according to .NET Framework rules. [Modifier] 
Auto
VB.Net - Modifiers