How to open Part 13 of a multi-volume archive: Split or Compressed file .013 files
Have you had trouble opening the 013 file on your computer? What are 013 files? We explain what they are and recommend software that we know will open them.
What is 013 file?
A 013 file extension is associated with the Split file or Compressed file from a multi-volume archives (part 13).
Part 13 of a multi-volume archive: Split or Compressed file description
The 013 file extension is generally related to to split files. A part of larger file split using splitter software, such us HJSplit, WellTek 001 File Joiner & Splitter, SplitJoin or File Managers, such as Total Commander. It is also associated with several archivers or compression tools, which are using, or did use in the past, the 013 file extension for its multi-volume files or archives, such as Winrar (see part13.rar) or 7-Zip (see 7z.013).
In case of split files, you will need to merge them first with the use of the splitting/joining software tool, before you can open or work with them. If the files are compressed multi-volume archives, you will have to extract the first one and it will automatically continue to extract all the parts. In either case, you will need ALL the parts to access the original content.
Suggested software to open 013 file

7-zip
Popular open source file archiver with a high compression ratio

HJSplit
A freeware file-splitting software
SplitJoin
A small program for spliting and merging files

Total Commander
Highly popular file manager for Windows
There are other 013 filename extensions with the same .013 suffix
013 - Winfunktion Mathematic v8.0 Julia fractal: .julia
A 013 file extension is related to the Winfunktion Mathematik v8.0 software. A 013 file stores julia fractal. Probably obsolete.