Ds-5 Eclipse cannot read environment file env.ini

I have installed ARM DS-5 on my PC (Windows 10 64-bi); When launching Eclipse I got an error message:

Could not read environment file C:...\ds5\win_64\r5p0-27rel0\sw\info\env.ini": Operation not permitted

I have Full Control of this env.ini file and can open it with notepad to read/write; So not really a file permission issue.

Any idea why Eclipse cannot start?

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