Add those 2 lines in the end of your FASMW.INI file
[Environment]
fasminc = c:\fasm\include
Ps: c:\fasm\include --> FASM path instalation.
Next, add %fasminc%\ path to the examples that you want to run.
Example:
; example of simplified Win32 programming using complex macro features
include '%fasminc%\win32ax.inc'
.code
 start:
    invoke MessageBox,HWND_DESKTOP,"Hi! I'm the example program!","Win32 Assembly",MB_OK
    invoke ExitProcess,0
.end start
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