: Likely stands for Version 03.26 of a "TI" (possibly Texas Instruments) related technical package or interface.
: The software will automatically pull data from the other parts to recreate the original full-sized file. sc23290-TIv0326.part1.rar
: Open only part1.rar using software like WinRAR , 7-Zip , or The Unarchiver . : Likely stands for Version 03