Hello,
Since the file is already 5.25 GB, there's still a chance it contains recoverable data. First, make a copy of the file and try opening it with VLC instead of the default Windows player.
The key is to check whether the file actually contains video and audio streams. Tools such as MediaInfo or FFprobe can confirm this. If the streams exist, the file may simply have corrupted metadata and could potentially be repaired. If no audio or video streams are present, recovery is unfortunately unlikely.
Also check for temporary Snipping Tool files in:
Plain Text
%LOCALAPPDATA%\Packages\Microsoft.ScreenSketch_8wekyb3d8bbwe\TempState
Microsoft has indicated that temporary recordings may sometimes be found there after recording or save issues. [learn.microsoft.com]
Unfortunately, if the audio was never captured by Snipping Tool in the first place, it cannot be recovered later. This is a known behavior when audio capture fails during recording. [learn.microsoft.com]
I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!
Domic Vo.