How to make Vim auto-complete with / for path instead of \

Currently Vim pop-ups for path completion, shows like ..\css\style.css But, backslashes doesn't work in Firefox for some reason, So, I want VIM to auto-complete as ../css/style.css (Notice, difference in slashes开发者_运维技巧).

How to achieve this? Thanks.

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set shellslash

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Even on Windows, I never use noshellslash.