Windows sometimes hides file extensions. Your file might accidentally be named wincmd.key.txt .
To do this, follow these steps:
For modern versions of Total Commander, you do not need to hunt down system folders manually. Open Total Commander. total commander wincmdkey
<TotalCmd> <Username>John Doe</Username> <key>12345678-12345678-12345678-12345678-12345678</key> <Signature>ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890</Signature> </TotalCmd> Windows sometimes hides file extensions