The filename SD.7z.003 suggests you are looking at the third part of a .
: Place SD.7z.001 , SD.7z.002 , and SD.7z.003 in the same folder .
To "make text" or access the content from this file, you must first the full archive. You cannot open part .003 on its own. How to extract the contents SD.7z.003
If you'd like, I can help you find a specific for your computer or explain how to re-split your own large files.
: Often used for SD card images for devices like the ArkOS or R36S . The filename SD
: The software will automatically find the other parts and combine them into the original file or folder.
: Use a program like 7-Zip or WinZip to open only the .001 file. You cannot open part
7 Easy Ways to Open 7z Files: WinZip, 7-Zip, & More - wikiHow