Does View:=acViewPreview apply to Forms?

[MIMF]

I am using some code from a book to read the value selected in a Combo box and use it to open up a Continuous Form page.
i.e. user chooses the country and the Form view opens up listing all the forms that pertain to that country.

If the code is opening a Report it reads as
Sub CntryR()
If IsNull(Me.cboSelectC) Then
DoCmd.OpenReport "ReviewsbyCountry", View:=acViewPreview
Else
DoCmd.OpenReport "ReviewsbyCountry", View:=acViewPreview, WhereCondition:="ReviewsbyCountry=" & Me!cboSelectC
End If
Me.cboSelectC = Null
End Sub

When I use that same code for Forms I have
DoCmd.OpenForm "ReviewsbyCountry", View:=acViewPreview

It opens up the form OK but shows nothing in the details section.
Anyone know what I am doing wrong? When I open the ReviewsbyCountry form by itself, it opens up fine.

I have looked this up in a bunch of places and can't find out what 'ac' means or if it even applies to Forms.