: You can use a hex editor like HxD to look at the "file signature" (the first few bytes), which provides a more reliable identification than the extension itself.

: Tools like CheckFileType.com allow you to upload unknown files to determine their true format based on internal headers rather than the name.

: Part numbers for specialized mechanical components, such as shock mount brackets or rod bearing shells, frequently use five-digit sequences (e.g., 50572 or 5149572). Troubleshooting an Unknown File