If the Playit app password-protected the file, simply renaming it might not work. The video data itself may be encrypted. You must open the Playit app, enter your password/Pattern to unlock the vault, and use the "Unhide" feature (Method 1) to decrypt the data properly.

: Provides a "Convert Now!" button for batch conversions and allows you to adjust the bitrate and frame rate. VEED.io Video Converter

To successfully convert your Playit video to a normal video:

Download your normal video.