The MS docs state that the FileIdInfo enum for GetFileInformationByHandleEx is only available in Windows 8 and above.

Is there an alternative function that returns the same FileIndexHigh/FileIndexLow info for a particular file for Windows 7?

CodePudding user response：

GetFileInformationByHandle (the non-Ex older function) exists on all versions of NT and provides the file id.

Note: You should try the Ex version first if it is there because ReFS uses 128-bit file ids!