More notes

examples/_mu/README.md

@@ -4,7 +4,7 @@ This is an experiment. So far, it's nearly but not quite working.
 
 To build the MSI package:
 
-1. Run `pynsist installer.cfg --no-makensis` to assemble the necessary files.
+1. Run `pynsist installer.cfg --no-makensis` to assemble the necessary files. (If necessary, `pip install pynsist`)
 2. Run `prep_files.py` in this folder to move some files and call 'heat' to
    make a list of the files.
 3. Run `wixit.py` in this folder to build the msi package.

examples/_mu/wrapper.wxs

@@ -1,4 +1,7 @@
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
+   <!-- UpgradeCode should be the same across versions of one app,
+   but must be different for another app. If you copy this, generate
+   a new UUID for it! -->
    <Product Id="*" UpgradeCode="4981284B-DCB8-4257-91CA-D79EDC94A9E8" 
             Name="Mu Editor" Version="0.0.1" Manufacturer="Trylan Erruh" Language="1033">
       <Package InstallerVersion="200" Compressed="yes" Comments="Windows Installer Package"/>
@@ -26,4 +29,4 @@
 		 <ComponentRef Id="ApplicationShortcuts"/>
       </Feature>
    </Product>
-</Wix>
+</Wix>