File not found error

When I attempt to include a file in my ASM program, the compiler `Can't locate file`.  For example:
```
    sound_data:
        INCLUDE  "kingsv.wav" ; 51.529 bytes		
```
Note that my `.asm` file and `kingsv.wav` file are in the same directory (root directory)

I have also changed the setting `Masmtasm.ASM` working mode to `workspace`

Have I missed anything? Thanks