Hand histories from AmericasCardRoom (ACR) client are saved by default in "C:\AmericasCardroom\handHistory" directory.

To check it, do the following:

1. Open AmericasCardRoom client.

2. Click on "Game Info" at the top menu.

3. Click on "View Hand History".

4. Click the "Options" button at the bottom of the appeared window.

5. Check the "Save Hand History" checkbox and "Destination folder" values.