Microsoft is expanding the Windows on Arm ecosystem through strategic partnerships in Japan, showcasing how App Assure—the company's engineering-backed compatibility team—is helping developers bring critical applications to Arm-powered Copilot+ PCs. The initiative highlights collaboration between Microsoft, software development companies (SDCs), and academic partners to ensure seamless app compatibility on next-generation Windows devices.
The App Assure Mission
App Assure serves as Microsoft's engineering support team dedicated to ensuring applications work seamlessly on new Windows platforms. As the Arm ecosystem expands, this team has become increasingly important, providing:
- Compatibility validation and testing
- Technical blocker resolution
- Hands-on engineering support
- Architectural best-practice guidance
The team's work spans globally, but Japan has emerged as a region of particular focus due to close collaboration with regional teams, SDCs, and the Japan University Co-op.
Success Story: PFU and ScanSnap
PFU Limited, a global leader in document scanning solutions, partnered with Microsoft in May to bring their flagship ScanSnap product to Arm architecture. The collaboration demonstrated the value of early engagement and focused engineering support.
Key outcomes included:
- Early completion of driver improvements
- Successful end-of-year release delivery
- Enhanced user experience on Arm-based Windows PCs
- Expanded product portfolio opportunities
According to Hiroyasu Goto, Manager of ScanSnap Software Development at PFU Ltd., the collaboration enabled the company to offer ScanSnap iX2500 and iX2400 as document digitization solutions for paper-intensive industries without disrupting existing operations. PFU is now looking forward to expanding Arm support across their entire product portfolio.
Success Story: Saito-Kikaku and Hidemaru Editor
App Assure also partnered with Saito-Kikaku, the company behind Hidemaru Editor—a text editor that has been a staple in Japan for over 30 years. The application, which began as a 16-bit program for Windows 3.x, has maintained compatibility through every Windows generation.
The Hidemaru Editor case demonstrated the power of Microsoft's Prism emulator, which automatically translates x86/x64 instructions into Arm64 instructions. The results were remarkable:
- Zero code changes required
- No rebuilds necessary
- Flawless compatibility achieved
- Complete operational validation passed
Takashi Yamamoto, lead developer at Saito-Kikaku, noted they were "impressed by the high level of compatibility" and that "there were absolutely no problems. It just worked."
Prism: The Compatibility Bridge
Prism, the emulation technology built into Windows 11, serves as a critical bridge for legacy applications moving to Arm architecture. By automatically translating traditional x86/x64 instructions into Arm64 code, Prism enables:
- Seamless backwards compatibility
- Zero development effort for many applications
- Confidence for both developers and end users
- Reduced barriers to Arm adoption
The Hidemaru Editor case proves that even applications with decades of history can run on modern Arm hardware without modification.
Copilot+ PCs: Driving Arm Momentum
The push to Arm architecture is driven by the compelling benefits of Copilot+ PCs:
- Industry-leading performance: Outpacing competitors in both everyday and demanding workloads
- Breakthrough battery life: Hours longer productivity compared to traditional PCs
- Advanced AI acceleration: Built-in AI capabilities for responsive, intelligent computing
- Modern architecture: Foundation for next-generation Windows experiences
As Microsoft's recent Windows Developer blog highlighted, ongoing investment ensures developers can bring optimized experiences to market faster while customers can trust their essential apps to run reliably.
Global Momentum
What's happening in Japan reflects a global trend. Developers worldwide are discovering that Arm enablement is often smoother and faster than expected, opening their applications to a growing audience eager for AI-powered experiences. Consumers benefit from the industry-leading performance of Arm-powered Copilot+ PCs with confidence that critical applications will work flawlessly.
App Assure continues to support this momentum through:
- First-time SDC evaluations
- Mission-critical application support
- Ongoing compatibility validation
- Engineering collaboration and guidance
For developers seeking assistance bringing applications to Arm, Microsoft offers the Windows Arm Advisory Service.
TL;DR
- Microsoft's App Assure team is accelerating Windows on Arm adoption through strategic partnerships in Japan
- PFU successfully brought ScanSnap document scanning to Arm with early driver improvements and end-of-year release
- Hidemaru Editor achieved flawless Arm compatibility using Prism emulation with zero code changes required
- Copilot+ PCs deliver industry-leading performance, breakthrough battery life, and advanced AI acceleration
- Global developers are finding Arm enablement smoother than expected, opening apps to growing AI-powered device market
Sources
Windows Blog: Accelerating Arm momentum in Japan with App Assure