Tools: Using env variable in Path

[ohrenkino]

As far as I understand it, you set the environment variables outside MP3tag and then reference them with $getenv().
Here are some examples:

App path in Export target

How can I get "Export file name" to reference a path relative to Mp3tag.exe? e.g. $filename($getenv(MP3TAGEXEPATH)..\myfile.txt,ANSI) -> S:\TLIB importing! Curtains\mp3tag..\myfile.txt