Here a little script to load a TGA image file and create a GDI+ bitmap. Currently supported TGA formats are 1/8/15/16/24 and 32-bit.
As v0.85 is written completely in AutoIt, it might take some time to convert larger 8/15/16/24/32-bit images. ☕
_GDIPlus_TGAImageLoadFromFile.au3 UDF...