Place the .ex4 file and the decompiler in a dedicated folder.
The is largely a relic of the past. While it was a powerful tool for older versions of MetaTrader, it is mostly ineffective against modern files and poses a significant security risk to your computer. For modern trading needs, focusing on learning MQL4 or hiring a developer to recreate a strategy is a much safer and more productive use of time. Ex4 To Mq4 Decompiler 4.0.401.1 43