Error with Playmovieaction on Igor7 (Windows)

I can't make the PlayMovieAction open=fullPath cmd work.

I've tried to write the fullPath as "C:\users\XXX\XXX.avi" or as "c:users:xxx:xxx.avi" and nothing works, while using the same fullPath with the cmd Playmovie as "C:\users\XXX\XXX.avi" works perfectly.

 

 

Does this example code work?

Function/S DoOpenFileDialog()
	Variable refNum
	String message = "Select a file"
	String outputPath
	String fileFilters = "Movie Files (*.avi,*.mp4):.avi,.mp4;"
	fileFilters += "All Files:.*;"

	Open /D /R /F=fileFilters /M=message refNum
	outputPath = S_fileName
	
	return outputPath		// Will be empty if user canceled
End

Macro PlayMovieActionDemo()
	String fullpath = DoOpenFileDialog()
	PlayMovieAction open = fullpath
	PlayMovieAction gotoEnd, getTime
	Variable tEnd = V_Value
	PlayMovieAction step=-1, getTime
	Print "frames = ", tEnd/(tEnd-V_value)
	PlayMovieAction kill
End