To combine files on Windows:
Say you split a file named Report.doc into the chunks Report.doc.a.split, Report.doc.b.split, ... Then in Windows from the command prompt run:
copy /b Report.doc.* Report.doc /b
If you split a file with Archiver on your Mac then you can combine the files on Windows.
Say you split a file named Report.doc into the chunks Report.doc.a.split, Report.doc.b.split, ... Then in Windows from the command prompt run:
copy /b Report.doc.* Report.doc /b
Note that the above will not work if you selected the “Compress” option when splitting files. 7zip-compressed split files can be combined using other archiving programs.
If you ticked “Checksum” you must delete the checksum file (the file with ending .chksplit) before running the command.