Ok, an updated version of Corvitextu can now be downloaded from the link above (rar name is the same, but program and readme.rtf changed.

Changes:

Chose a target directory first. Check the "K" checkbox before you load a single texture. The directory you determined will now be kept as a source. Uncheck the "K" checkbox to switch to a new directory and check it again if you want to keep the new one. "K" works only with single texture loading, but with all file formats.

A large pic can now be loaded witch checkbox -stretch view to screen- and is ready to be cropped. If you cropped a 512x512 screen from a very large pic you can now leave the -stretch view to screen- checkbox checked and use all seamless and fuzzer tools. Originally they were only available when the -stretch view to 512x512- was set. Then save the cropped screen and load in the next big pic right away. No annoying checkbox changing anymore when cropping.

In short: (If you want to test and use my texture folder that).
Start program.
Determine target folder.
Set checkbox -Stretch view to screen-
Set chekbox "K"
Press -load texture button- and select my 'textures' folder
Load a texture
Right mousebutton to go back to control panel
choose -crop from large texture-
click on upper left point (of square) on screen, then on the right down one
Croped screen appears on screen.
Use seamless blendig tools and check 'seamlessness'
Use fuzzer to improve texture again.
Save new texture with -save cropped screen2target dir-
Or save to 512x512 with original filename (extender changed to bmp)
Load next texture from textures folder...

Ok, hope you like Corvitextu. If you encounter any heavy bugs, feel free to post it here.

Neodumont