Probably a false positive... Run should run it through http://www.virustotal.com and not rely on what one AV finds...
And/Or submit the file to one of the antivirus companies for analysis they will find if the file really contains trojan horse code or not.
Another post also shows the same https://www.mql5.com/en/forum/130064
but virustotal shows no problem VirusTotal - Free Online Virus, Malware and URL Scanner
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MetaLang.exe
The file 'MetaLang.exe' has been determined to be 'MALWARE'. Our analysts named the threat TR/Crypt.XPACK.Gen. The term "TR/" denotes a trojan horse that is able to spy out data, to violate your privacy or carry out unwanted modifications to the system.Detection is added to our virus definition file (VDF) starting with version 7.00.05.171. Please note that Avira's proactive heuristic detection module AHeAD detected this threat up front without the latest VDF update as: TR/Crypt.XPACK.Gen.
http://analysis.avira.com/samples/details.php?uniqueid=jNmx4vx0yCsDHktzAE4Hj76M5w6PQGKM&incidentid=636133