ARRI Alexa - Media Manager - Error 34

We had some problems with the Alexa and slomo-clips in Final Cut Pro 7.
This might be interesting for those who shoot slomos with the Alexa.

Problem: When consolidating Alexa Files without sound in FCP 7 (Media Manager) the message "Could not copy because of error 34". The wired thing is, that the clips are copied (to the destination you set it to). They appear as blank files with an -v in the end. They seem to be unfinished.

Solution: Add .mov in the end of the clip and Quicktime can read it. If you have a batch of files, take "A better finder rename" to perform all renames.

Cheers Stefan