https://play.golang.org/p/u04yaVMIgHy

README.md

GUID Converter

When MSIs are installed on a Windows system, the GUID of a UpgradeCode or ProductCode are "formated" and then stored in the registry, this makes it difficult to locate related registry keys.

This gist provides a simple Golang script (with provided play link) to convert a GUID into a formated version that can be searched.

For the record, to convert a guid to the format used in the registry

e.g. for {D0F23C3F-CA74-460F-9ADB-49CBD57F9688}

1. Reverse first 8 characters F3C32F0D
2. Reverse next 4 characters 47AC
3. Reverse next 4 characters F064
4. Reverse next 2 characters A9
5. Reverse next 2 characters BD
6. Reverse next 2 characters 94
7. Reverse next 2 characters BC
8. Reverse next 2 characters 5D
9. Reverse next 2 characters F7
10. Reverse next 2 characters 69
11. Reverse next 2 characters 88

thus {D0F23C3F-CA74-460F-9ADB-49CBD57F9688} becomes F3C32F0D47ACF064A9BD94BC5DF76988

guidToWindowsRegistry.go

package main

import (
	"fmt"
	"strings"
)

func main() {
        // Change this value to the GUID to
        // be formated
	upgradeCode := "{96272B69-938E-4C50-9068-88EB1CEA08B6}"
	
	upgradeCode = strings.Replace(upgradeCode, "{", "", -1)
	upgradeCode = strings.Replace(upgradeCode, "}", "", -1)
	upgradeCode = strings.Replace(upgradeCode, "-", "", -1)
	formatedCode := ""
	
	for i := 7; i > -1; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 11; i > 7; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 15; i > 11; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 17; i > 15; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 19; i > 17; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 21; i > 19; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 23; i > 21; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 25; i > 23; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 27; i > 25; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 29; i > 27; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	for i := 31; i > 29; i-- {
		formatedCode = formatedCode + string([]byte{upgradeCode[i]})
	}
	
	fmt.Println(formatedCode)
}