.avi interlace or progressive flag

Hi, please can you help a c*t?

I have 2 video .avi files:

one is an uncompressed interlaced video file https://dl.dropboxusercontent.com/u/39871584/INTERLACE.AVI

and one is uncompressed progressive video file https://dl.dropboxusercontent.com/u/39871584/PROGRESSIVE.AVI

MediaInfo correctly recognize the interlaced one as interlaced, and the progressive one as progressive.

But now I wonder: using the HEX editor, can I modify a flag of the progressive one so that it is recognized as interlaced?

Thanks