Detect Filetype

Format Detection will read inside the files to try and figure out what kind of file it is. If a file is recognized the correct file extension will be added to the filename. This can be useful if you e.g. download a file with an incorrect or non-existing file extension, or if you somehow have deleted the extension from your filenames.

Currently Flash Renamer correctly identifies 30 file formats: ZIP, GIF, EXE, JPG, HTML, MP3, BMP, TIF, PSD, RAR, ARJ, PSP, 7Z, FLV, MID, AGP, PNG, ASF, CAB, AI, SWF, MPG, LZH, MOV, IFF, AVI, WAV, ACE, EMF & TGA!

Keep Old Extension - If the filename already contain a file extension it will be kept and the new extension will be added after it. Otherwise the old extension will be replace with the new one.
Advanced Detection - If the normal detection should fail, Flash Renamer can try to detect some types using special routines:
- Text/Html - Detecting text will scan the first 64 bytes of the file, and if they are all readable it will be assumed that it is a text file. Note that many non text files, such as configuration files, actually contain readable text and will be renamed using this. Detecting Html is similar to text, but instead searches for <HTML inside the first 64 bytes.
- Mp3 - Detecting Mp3 will try to find an Mp3 frame inside the file. If one is found it will locate the next frame to verify that the file actually contains Mp3 data. This will identify 99.9% of all Mp3 files, but sometimes other files are identifies as Mp3 as well. Don't use this unless you suspect the files contain Mp3 music.

For Advanced Users:

The recognized file formats are stored in a file called "filetypes.txt" and can be found in the Flash Renamer settings folder. You can add file types by yourself, instructions are found in the file. If you should mess things up, simply delete the file and it will be automatically recreated the next time you start the program. If you add useful file types please send them to me and I will add them to the next release!