fix default arg handling and error messages in win_file_version

lib/ansible/modules/extras/windows/win_file_version.ps1

@@ -26,19 +26,14 @@ $result = New-Object psobject @{
     changed = $false
 }
 
+$path = Get-AnsibleParam $params "path" -failifempty $true -resultobj $result
 
-If ($params.path) {
-    $path = $params.path.ToString()
 If (-Not (Test-Path -Path $path -PathType Leaf)){
-        Fail-Json $result "Specfied path: $path not exists or not a file"
+    Fail-Json $result "Specfied path $path does exist or is not a file."
 }
 $ext = [System.IO.Path]::GetExtension($path)
 If ( $ext -notin '.exe', '.dll'){
-        Fail-Json $result "Specfied path: $path is not a vaild file type, Must be DLL or EXE."
-    }
-}
-Else{
-    Fail-Json $result "Specfied path: $path not define."
+    Fail-Json $result "Specfied path $path is not a vaild file type; must be DLL or EXE."
 }
 
 Try {