Try to find out when listing windows SDKs fails

.appveyor.yml

@@ -25,10 +25,13 @@ install:
         Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
           throw "There are newer queued builds for this pull request, failing early." }
 
-  # Temporary debug stuff as I have no idea how else to get this info
-  - ps: "[System.Environment]::OSVersion.Version"
+  - ECHO "random debugging stuff"
   - ps: "ls \"C:\\Program Files\\\""
   - ps: "ls \"C:\\Program Files (x86)\\\""
+
+  - ECHO "OS version:"
+  - ps: "[System.Environment]::OSVersion.Version"
+    -
   - ECHO "Filesystem root:"
   - ps: "ls \"C:\\\""
 
@@ -39,6 +42,7 @@ install:
   - ps: "ls \"C:\\projects\\$env:APPVEYOR_PROJECT_SLUG\\\""
 
   - ECHO "Installed SDKs:"
+  - ps: "ls \"C:\\Program Files\\Microsoft SDKs\\\""
   - ps: "ls \"C:\\Program Files\\Microsoft SDKs\\Windows\\\""
 
   # Prepend newly installed Python to the PATH of this build (this cannot be