Description of the Issue

Allow forward slashes in file path names

Steps to Reproduce the Issue

1. Press Ctrl + O (Open file)
2. Insert absolute file name with one or more forward slashes F:\Temp/text.txt
3. Click "Open"

Expected Behavior

Notepad++ opens a file without problems. It's possible to replace forward slashes with backslashes if required.

Actual Behavior

Notepad++ does not open file with messages The file name is not valid.