W10MUI_10 (by @abbodi1406) works fine: Code: ============================================================ Prepare work directories ============================================================ ============================================================ Detect language packs details ============================================================ ja-JP: 64-bit {x64} - 17763 ============================================================ Detect install.wim details ============================================================ Build: 17763 Count: 1 Image(s) Arch : 64-bit ============================================================ Extract language packs ============================================================ ja-JP / 64-bit ============================================================ Mount install.wim - index 1/1 ============================================================ Deployment Image Servicing and Management tool Version: 10.0.17763.1 Mounting image [==========================100.0%==========================] The operation completed successfully. ============================================================ Add LPs to install.wim - index 1/1 ============================================================ Deployment Image Servicing and Management tool Version: 10.0.17763.1 Image Version: 10.0.17763.1 Processing 1 of 1 - Adding package Microsoft-Windows-Client-LanguagePack-Package~31bf3856ad364e35~amd64~ja-JP~10.0.17763.1 [==========================100.0%==========================] The operation completed successfully. Deployment Image Servicing and Management tool Version: 10.0.17763.1 Image Version: 10.0.17763.1 Processing 1 of 1 - Adding package Microsoft-Windows-LanguageFeatures-Basic-ja-jp-Package~31bf3856ad364e35~amd64~~10.0.17763.1 [==========================100.0%==========================] The operation completed successfully. ============================================================ Update language settings ============================================================ ============================================================ Unmount install.wim - index 1/1 ============================================================ Deployment Image Servicing and Management tool Version: 10.0.17763.1 Image File : I:\W10MUI_10\install.wim Image Index : 1 Saving image [==========================100.0%==========================] Unmounting image [==========================100.0%==========================] The operation completed successfully. @abbodi1406 is it possible to add the current language of the used wim? I mean here: Code: ============================================================ Detect install.wim details ============================================================ Build: 17763 Count: 1 Image(s) Arch : 64-bit ============================================================