Because many actually are viruses. Even clean ones use packers and code injection techniques similar to malware.

Remember: No tool can perfectly recreate lost MQL4 artistry. The safest, most reliable method is to rebuild your EA logic manually, using the original EX4’s behavior as a specification. Q1: Is there any official EX4 to MQ4 tool from MetaQuotes? No. MetaQuotes intentionally does not provide decompilation tools to protect intellectual property.

But what does the number 40432 refer to? Is it a decompiler version, a MetaTrader build number, or simply a marketing gimmick? And crucially, are these tools safe, legal, and effective?