* finding index of char/substr in string
* finding first occurence char from subset in string starting from index.
* replacing char/substring in string
* conversion to/from C-style strings (for easier using strings in Windows functions).
* concatenating string (in current system name of veriable is joined with following text, which can make trouble in some cases) OR append-to-text function.
PS. How to display path text from string char in Label control of dialog window? I have to convert it to C-style string; creating such function in current script would be quite painful.
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