Issue with Unity Standalone builds and external WEM files on OSX

Question

Hey there,

We're having an issue in our Standalone OSX builds where our voice-over files aren't playing (these are set up as .wem files, set up using the guide here: https://www.audiokinetic.com/library/2017.1.0_6302/?source=SDK&id=integrating__external__sources.html ). It works fine in our Standalone windows 64bit builds, but on OSX when we attempt to play an External Source file we get errors that look like:

            AK Error: Cannot open file: ­¾­ÞÞÀݺÀÊF

Is this a known issue? We're using Wwise Version 2017.2.4.6590 with the Wwise Integration 2017.2.4.6590.1054 integration. We've confirmed that the *.wem files are getting built into our final .app into the StreamingAssets folder, and that we are setting up the information correctly when posting the event - this is what our code looks like:

            uint inIExternalSrcCookie = AkSoundEngine.GetIDFromString(string.Format("External_{0}", translatedLine.Speaker));

            AkExternalSourceInfo source = new AkExternalSourceInfo(translatedLine.AkExternalSourceFilename, inIExternalSrcCookie, AkSoundEngine.AKCODECID_PCM);

            AkSoundEngine.PostEvent(string.Format("Dialogue_{0}", Asset.Character), character.Presence.gameObject, 0, null, null, 1, source);