@Semsem_Semsem Did you read the linked post about restoring missing file extensions?
Start at paragraph
and when executing the script on the terminal, replace /path/to/vault-decrypted with the filesystem path to your CRYPTOMATOR_RECOVERY directory.
After the script execution, your files should have a file extension again, if possible.
The article about recovering lost data can be found here: Data Lost: How to restore missing Directories