Most email providers cap attachments at 25MB. Splitting allows you to send a 100MB file across four emails.
Right-click on the .001 file. Using a tool like 7-Zip or WinZip , select "Extract Here". ktj3hus50tfwyk.7z.002
Some platforms have "per-file" limits even if your total storage is large. Most email providers cap attachments at 25MB