Default folder for TEMP files, when the PORTABLE application is active WinPE10

The default folder for TEMP files in winpe, I have created a temp folder in the ram disk virtual drive, I want the software files when booted it to run by default on the R:\TEMP directory, and or it will overflow X:\Boot drive, can someone help me thank you in advance. 

If I understood you correctly,

you want redirection std. temp Folder,
boot winpe, open cmd, type set + Enter,
you will see a series of env variables,
among others you will find TEMP or/and TMP,
if you type TEMP=R:\TEMP + Enter > will change value.

Now you just make some script / cmd to make the change after boot or before running a particular program.

Depending on which project you use to create winpe, it may have an option to change "default TEMP".

WinPE10KTV

Tweaks\"Imdisk Ramdisk" Plugin already do all that you write with Win10PESE

I have done this many times, the portable application still has a temporary file in the TEMP folder on the (X:) Boot drive, I want to move it to the virtual drive that IMDISK has created by default R: \ TEMP. 

the portable application still has a temporary file in the TEMP folder on the (X:) Boot drive

Because the App's portable configuration is (hardcoded) that way - you need to be looking at the Apps configuration files

THANKS,
The application is created by WinRar, a temporary file directory named RarSfx0.

Aha, when you create a selfextract (sfx), you define where it will be unpacked,
now is probably defined X:\Temp or how it is.

You need to change it to: %Temp%

To avoid confusion, this is done when creating sfx.
 

The software in winpe I only do some applications, the rest is downloaded from the homepage, for example HWmonitor software, HWinFO I have tried to run in a different winpe with any application, it works well, I have used SET TEMP PATH, it works fine, have its CODE auto SET PATH directory R: \ TEMP is very good.

It's time to lern something new, it's not to complicated.

Unpack that archive somewhere,
here are instructions on how to create a new one > https://www.isunshare.com/blog/how-to-create-sfx-archive-with-winrar-and-7zip/
pay attention to "Advanced SFX options",
finish it and you solved the problem.
 

I will save the bookmark, I succeeded, thanks Nikky ....  ,
When my WinPE project is completed I will invite you to try it out, you are ok.