C64 track loader

I'm trying to preserve (and probably support in ScummVM) some Infocom text adventures on .d64 disk images (Guild of Thieves, Fish etc.).

I've hit a wall there unfortunately, because it seems that most of the games came as track loaders (at least the version i got my hands on).
Only a small .PRG is available which asks if a 1541/1571 should be used to load the game (and then does in VICE) but no more physical files.

Filer programs (Windows) and DiskImage.device's CBM fs only show the loader .PRG and no more files, a probable disk 2 is always "empty".

So, does anyone know how to get the rest of the data from the disks?
Is it even possible?
Maybe there's a C64 BASIC based tool/copy program that can do this?
I could always try with VICE in that case.

Thanks in advance

@Raziel

I cannot help you, but potentially this group could: https://kasettilamerit.fi/in-english/

@Capehill

Thank you for the link.
Will try to recopy them