How to run some etcpack.exe processes at the same time

I'm getting errors when running some etcpack.exe processes at the same time. It seems the processes use the same temporary file (tmp.ppm) therefore cannot access this file in a parallel way.

Could anybody please help me?

The error log:

[malitc-11]Mipmap level: 0

[malitc-1]Compressing. Output file: Z:\Projects\game\build\..\release\textures_android\ice_zone08_props_lm.ktx

error: Could not open file tmp.ppm

error: Could not read tmp.ppm file.

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