'If exist' code syntax when Custom Form printing via Word template

I have created a custom outlook form and have used the Word template method for printing it.

Within the Outlook form code I can define the template path/filename as e.g. 'strTemplate = "c:\templates\formprn.dot"' and all works OK.

However the word template could be in one of two locations so I would like to try something similar to the following:-

'If exist "c:\templates\formprn.dot" then
   strTemplate = "c:\templates\formprn.dot"
  Else
   strTemplate = "d:\templates\formprn.dot"
End if'

However, above syntax/command structure is incorrect and have been unable to find any sample code.

Can anybody point me in the right direction?

A.