Install Slack for Windows automatically when a new user logs in.

gistfile1.txt

@echo off
:make somewhat hidden MyCompany directory
mkdir C:\ProgramData\MyCompany\
:copy Slack Installer
copy \\myshare.mycompany.com\Applications\Slack\SlackSetup.exe C:\ProgramData\MyCompany\
:load default registry hive for all new users
REG LOAD HKU\TEMP "C:\Users\Default\NTUSER.DAT"
:add required RunOnce value
REG ADD HKU\TEMP\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce /v Slack /t REG_SZ /d "C:\ProgramData\MyCompany\SlackSetup.exe -s" /f
:unload hive
REG UNLOAD HKU\TEMP