Data Doctor FAT data recovery software supports to recovers different formats of file like AVI, 3GP, WMA, WMV, DAT, GIF, BMP, TEXT, DOC, MDB, EXE, JAR, JPEG, RAR, TIFF, RIFF, XLS from your all FAT partition file systems (FAT12, FAT16, FAT32, VFAT etc).
Do you want to join videos into one large file ? Have you tried other programs in order to merge videos of different formats, sizes and aspect ratios and you couldn't ?