Unable to delete files on Windows

[Tpessia]

Hey guys! Seems like the delete_old function is unable to delete retained logs on Windows with these PM2 configs:

{
"apps": [{
"name": "server",
"logDateFormat": "YYYY-MM-DD HH:mm:ss Z",
"errorFile": "./logs/server-err.log",
"outFile": "./logs/server-out.log",
"mergeLogs": true,
"script": "./index.js"
}]
}

The problems appears to be related to this line:
var fileBaseName = file.substr(0, file.length - 4).split('/').pop() + "__";

On my machine the split fails because the path has "" and not "/".

Because of that the following line fails to match the path, and no file is queued for deletion:
if (files[i].indexOf(fileBaseName) >= 0)