If the file is a RAR volume with a .rev (recovery volume) present:
Use a file manager like Everything (voidtools) to search your PC for “Schwarze Katze” to see if other parts exist in different folders. Tcniso Schwarze Katze V128.part
Since this is an obscure German title, check: If the file is a RAR volume with a
: Custom firmware often exposed users' personal information or allowed unauthorized network access. Tcniso Schwarze Katze V128.part
Translated from German as "Black Cat," was a comprehensive hacking toolset for early-to-mid 2000s hardware. It was famously used to flash custom firmware like "Sigma" or "Sigma X" onto devices like the Motorola Surfboard 5100 .