The flh file extension is used for a special video format. It uses the h.264 video codec and mp4a audio codec. The format is also known as Fash Video High Definition file.
Use VLC media player to play flh files. To convert flh files, use Freemake Video Converter to change them into bnk format.
An flh file follows the FLIC animation format. This format stores video and audio data efficiently for animation sequences. Most FLIC animations use the .FLC extension instead of .flh.
FLH files belong to the Video Files category along with 546 other formats. The most popular program to handle them is QuickTime Player.
If you cannot open an flh file, the issue is usually easy to fix without help. Update the application you normally use to open these files. Make sure the latest version supports the flh format. Also scan the file for viruses with antivirus software.
Autodesk Animator
XnView MP