Fate/stay night:Image manipulation
All the images in Fate/stay night have 32-bit color depth (24 bit per image + 8 bit per alpha-channel). Simply put, these are plain bitmap files with alpha-channel, just they're compressed.
tlg-files are encrypted, and one will need Susie with tlg-plugin to decrypt them. Having opened needed image, right-click it, select 'File' and 'Save as' will let you save it as 24-bit *.bmp. To get 32-bit color depth, open your bmp-file with graphic editor capable of working with alpha-channels (i.e. Adobe Photoshop) and create a new channel. In Photoshop, white areas of new layer mean visible parts of image, while black areas mean transparent ones.
To import image, one will want to use krkr package, v.219b19. Go to kirikiri2 -> tools -> krkrtpc.exe. Mark 3rd row in both first and second columns and drop your image onto program's window.