added main script

MSI-extractor.ps1

@@ -0,0 +1,31 @@
+Add-Type -AssemblyName System.Windows.Forms
+
+#Use Windows Forms to open a file select dialog
+
+$FileBrowser = New-Object System.Windows.Forms.OpenFileDialog -Property @{ 
+    InitialDirectory = [Environment]::GetFolderPath('Desktop') 
+    Filter = 'Windows Packages (*.msi)|*.msi'
+}
+
+$Out = $FileBrowser.ShowDialog() #Display the dialog
+
+#Select output directory
+
+$FolderBrowser = New-Object System.Windows.Forms.FolderBrowserDialog -Property @{
+    Description = 'Output'
+}
+
+$Out = $FolderBrowser.ShowDialog() #Display the dialog
+
+$FolderBrowser.SelectedPath #Variable stuff
+
+msiexec /a $FileBrowser.FileName /qb TARGETDIR=$($FolderBrowser.SelectedPath) # This uses the built in Windows tool to extract the MSI
+
+#A helpful message
+
+$Shell = New-Object -ComObject "WScript.Shell"
+$Button = $Shell.Popup("Once you install the MSI using this PowerShell script, please add any programs that run from a shell (i.e. CMD, PowerShell) be added to Path. 
+To add a program to path, search for Control Panel in Windows Search, and open it. Once in Control Panel,
+select User Accounts, then User Accounts again. On the side bar, select Change my Enviorment Variables.
+Select the Path variable, and then Edit. Select a unfilled box, and type the path to the program (for most, it can be just the root folder, some may need to be bin) and then Ok, and Ok again. 
+You WILL need to restart any open shells.", 0, "Thank you for using MSI-Extractor", 0)