How to change auto-complete behaviour in vim?
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Explain by example.

I want to split my window and open *file-x.txt*

In the folder where I am working I also have the set of files: from *file-a.txt* to *file-z.txt*

If I type:

`:sp file`<kbd>Tab</kbd>

Instead of getting 
`:sp file-`  As I usually get in bash.

I get:
`:sp file-a.txt`

This is not very convenient as I need to either tap <kbd>Tab</kbd> ridiculous times or type really long names.

Is there a way to set the auto-complete behaviour for VIM for file names?

Thank you for your time.