>>>My second question is: can I put path in config.fwp without drive letter, e.g.
>>>\redp\Work\Temp?
>>
>>Absolutely. This also works:
>>
>>TMPFILES=GetEnv('Temp')
>
>Mark,
>
>I'm already colfused, since I've created config.fpw, added it to the project, then ran it, and sys(2023) still returns d:\temp, as specified under Tools\Options...
>
>?getEnv('Temp') returns c:\Windows\Temp, which is not, what I need for this application.

I understand that. I just gave you an example of what can work. You also can not compile the CONFIG.FPW into the executable. It has to exist as its own file. From VFP help:

When you start Visual FoxPro you can use a default configuration file in the following locations (in order):

The current working directory.
The directory where Visual FoxPro is installed.
The directories listed in the DOS path.

If the default configuration file is not found in these locations, Visual FoxPro uses only the default settings established in the Options dialog box.

Also see VFP Help on Config Files on alternatives on how to specify the Config File to use.