Unlock is failing under Windows and Linux (smudge filter failed).

I installed the official version released (git-crypt-0.7.0-x86_64.exe) for Windows and tried to unlock my repository. It seems it fails with some files. Possible encoding problem?
This repo is being used successfully in Unix envs.

``` bash
PS C:\Users\Edu\Documents\GitHub\zettelkasten> git-crypt-0.7.0-x86_64.exe unlock
git-crypt: error: encrypted file has been tampered with!
error: external filter '"C:\\Program Files\\git-crypt\\git-crypt-0.7.0-x86_64.exe" smudge' failed 1
error: external filter '"C:\\Program Files\\git-crypt\\git-crypt-0.7.0-x86_64.exe" smudge' failed
fatal: Company/secrets/git/README.md: smudge filter git-crypt failed
Error: 'git checkout' failed
git-crypt has been set up but existing encrypted files have not been decrypted
```

The same error is happening in Ubuntu Linux.