Hello, In past I have used the following commands to extract MSU (KB updates) files: Code: expand -F:* X86-all-windows8.1-kb2919355-x86_de9df31e42fe034c9a763328326e5852c2b4963d.msu d:\Dec1 expand -F:* Windows8.1-KB2919355-x86.cab d:\Dec2 However currently the 2nd command completes with error and some files are extracted successfully (like CAT, MUM, Manifests) but the others (like updated system files) aren't... Today I wanted to extract: W8-1-1 x32 refs.sys file b17031 from the update above (W8-1-1) from package: Code: x86_microsoft-windows-refs_31bf3856ad364e35_6.3.9600.17031_none_3b493768385a5e30 ...but the directory above is empty after extraction... Could ANYBODY HELP me? Thanks Error message of 2nd expand command: Code: Expanding Files .... Progress: 26331 out of 36602 files One or more files could not be expanded. Delta Package Expander Returned 0x80070 00d Expanding File windows8.1-kb2919355-x86.cab Incomplete, Error Code=0x8007000d Error Description: Invalid data. 36602 files total.