Windows10
In Xojo 2016r3, Picture.Open a WMF file gives the picture
In Xojo 2016r4.1, Picture.Open a WMF file gives NIL
why ?
http://documentation.xojo.com/index.php/Picture.IsImportFormatSupported
I don’t see anything about WMF, so it might have been sheer luck that it worked to begin with.
The major difference between 2016r3 and 2016r4 is the switch from GDI+ to Direct2D
Edit: Okay, I found on the main page of Picture that WMF was supported, but there was also this note:
So it may have not made it through when they switched from GDI+
File a feedback report?
What do you want to do with WMF?
Our DynaPDF plugin can convert WMF to PDF.
PS: or you can write little app in Xojo 2016r3 to convert to PNG.
I just want to print the wmf picture…
And App.UseGDIPlus is always false in this project
Christian your plugin can read a wmf file to get a picture ?
Let me check tomorrow. Maybe grsphicsmagick plugin does it already.
tomorrow never knows 
Is it FALSE, because you need it to be?
or because you never set it to TRUE?
App.UseGDIPlus is false, because I tried true, but the result on all the graphics displayed was catastrophic.
Then it remained false, and it did not prevent me to read WMF…