There is a bug in Mod Manager that prevents you from packing LE1 mods, containing TLK files for GAME1_EMBEDDED_TLK feature, into one archive with mods for other games. This happens only with cmmver 8.0 and higher.
This should be fixed now for Mod Manager 9. It was not prefixing the game in multipacks. Thanks for reporting, if you find more bugs please feel free to open an issue.
There is a bug in Mod Manager that prevents you from packing LE1 mods, containing TLK files for GAME1_EMBEDDED_TLK feature, into one archive with mods for other games. This happens only with cmmver 8.0 and higher.