Fixed string expansion

Author: iainbrighton

VirtualEngine.Compression.psm1

@@ -1,12 +1,12 @@
 ## Import the .Net 4.5 compression binaries as this is needed to be able to parse the
 ## VirtualEngine.ZipArchive.ps1 file.
-Write-Debug "Loading 'System.IO.Compression' .NET binaries.";
-Add-Type -AssemblyName "System.IO.Compression";
-Add-Type -AssemblyName "System.IO.Compression.FileSystem";
+Write-Debug 'Loading ''System.IO.Compression'' .NET binaries.';
+Add-Type -AssemblyName 'System.IO.Compression';
+Add-Type -AssemblyName 'System.IO.Compression.FileSystem';
 
 ## Import the VirtualEngine.ZipArchive.ps1 file. This permits loading of the module's
 ## functions for unit testing, without having to unload/load the whole module.
-. (Join-Path (Split-Path $PSCommandPath) VirtualEngine.ZipArchive.ps1);
+. (Join-Path -Path (Split-Path -Path $PSCommandPath) -ChildPath VirtualEngine.ZipArchive.ps1);
 
 ## Export public functions
 Export-ModuleMember -Function *-*;