is it possible to have a fat32 rootfs partition instead of ext4?

I've successfully installed u-boot and linux kernel on STM32F469-disco board but I still don't have a rootfs. my board has 16MB RAM and 16MB FLASH storage and 32GB SDCARD and the CPU core of it is ARM Cortex-M4 32bit processor. I want to know can I just copy my busybox rootfs to a fat32 partition and expect the linux kernel to read it? when I try to copy it to an NTFS partition it throws this error:

PS C:\Users\mahya> copy -r z:\home\mahyar1284\my_projects\buildroot\buildroot-2020.08\output\target\ c:\users\mahya\desktop\target
Copy-Item: The name of the file cannot be resolved by the system. : 'Z:\home\mahyar1284\my_projects\buildroot\buildroot-2020.08\output\target\linuxrc'

--- *UPDATE* tried it with tar command:

C:\Users\mahya>tar -cf -r z:\home\mahyar1284\my_projects\buildroot\buildroot-2020.08\output\target\*
tar: Couldn't open z:/home/mahyar1284/my_projects/buildroot/buildroot-2020.08/output/target/linuxrc: Invalid argument
tar: Error exit delayed from previous errors.