How to translate paths with environment variables (Eg. %temp%)

I am searching for a winapi function to expand paths with environment variables. I have tried GetFullPathName but the result is weird: "%appdata%\some开发者_运维问答thing" becomes "C:\<path to directory of exe>\%appdata%\something".

How to do this correctly?

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Try ExpandEnvironmentStrings.

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Cause I needed it with C#/.NET: Environment.ExpandEnvironmentVariables Method

I hope it'll help somebody.