This string you’ve provided appears to describe a custom or unofficial build of Windows 10 Pro, not a standard release from Microsoft. Let me break it down for you:
windows 10 pro → Editionrs4 → Redstone 4 (Windows 10 version 1803, April 2018 Update)v180317134191 → Likely a compiled build tag or installer versionenus → English (US) languagex64 → 64-bit architecturejuly2018 v3 → Possibly a repack or updated third-party “release” from July 2018prea → Unclear abbreviation; may mean “preactivated” (common in modified ISOs)64 bit → Redundant, just confirming architectureSince this is the "April 2018 Update," it introduced several features that were considered major upgrades at the time. If you are using this for a specific purpose (like running older software or a low-end PC), these are the highlights:
A. Timeline (The Biggest Feature of RS4) This build introduced Timeline via the Task View button. It allows you to scroll back through your activity history (files opened, websites visited, apps used) by days or weeks. It effectively works like a "time machine" for your productivity, syncing activities across other Windows 10 PCs if enabled.
B. Focus Assist (Quiet Hours) This was the rebranding of "Quiet Hours." It allows you to suppress notifications automatically based on rules (e.g., when you are duplicating your display for a presentation, or during set "focus" hours). It is very useful for minimizing distractions while working. This string you’ve provided appears to describe a
C. Near Share (Bluetooth File Transfer) This build introduced a native "AirDrop" style feature. You could right-click a file and share it via Bluetooth to a nearby PC. This was a lightweight way to move files between laptops without USB drives.
D. Native FLAC and HEVC Support RS4 improved native support for media formats. It had better built-in support for FLAC audio and high-efficiency video coding (HEVC/H.265), which meant you often didn't need to install third-party codec packs (like K-Lite) as frequently.
E. Reduced "Bloatware" (Pre-Activation Aspect) The "v3 prea" tag suggests this is a modified ISO. Custom ISOs from 2018 were often popular because they were "stripped" or "lite" versions. They often removed Windows "bloatware" like the original Candy Crush, Twitter, and Xbox apps that Microsoft forced into the Start Menu. This made the installation cleaner and slightly faster on older hardware. windows 10 pro → Edition rs4 → Redstone
Instead of risking a July 2018 pre-activated release, use Microsoft’s official sources:
windows 10 pro rs4 v180317134191 enus x64 july2018 v3 prea 64 bitIf you’ve encountered this filename online — on a torrent site, forum, or file-sharing platform — you’re looking at something that does not originate from Microsoft. Let’s break it down piece by piece.
Warning: Using modified Windows ISOs carries significant risks. Integrity Violation: The hash values (SHA-256
| Part | Meaning | Official? |
|------|---------|------------|
| windows 10 pro | Edition: Windows 10 Pro | ✅ Legit |
| rs4 | Redstone 4 — internal Microsoft codename for version 1803 (April 2018 Update) | ✅ Legit |
| v180317134191 | Likely a custom build timestamp (March 17, 2018, 13:41:91 format — invalid for MS builds) | ❌ Unofficial |
| enus | English (United States) language | ✅ Legit |
| x64 | 64-bit architecture | ✅ Legit |
| july2018 v3 | Third version/revision from July 2018 | ❌ Not MS standard |
| prea | Possibly "Pre-Activated" | ❌ Dangerous |
| 64 bit | Repeated emphasis on architecture | ❌ Redundant |
Key red flags:
17134.1 or 17134.112.