: Ensure every sequential file from the set is in the same directory (e.g., tbc001.7z.001 , tbc001.7z.002 , etc.). Use 7-Zip : Right-click on the first part ( tbc001.7z.001 or tbc001.7z ).

The file is likely the first part of a split 7-Zip archive . To "put it together" or extract the original content, you generally need all the numbered parts (e.g., .001 , .002 , .003 ) in the same folder. Steps to Reassemble Split Files