Windows 1.0 In*a*Vision 1.01 runtime build
| Build of Windows 1.0 | |
 In*a*Vision 1.01 running on the bundled September 1985 build runtime | |
| OS family | 16-bit Windows |
|---|---|
| Version number | 1.00 |
| Architecture | x86 16-bit |
| Compiled on | 1985-09-20 |
| About dialog | |
The In*a*Vision 1.01 runtime build of Windows 1.0 is a September 1985 build used as the runtime for Micrografx's In*a*Vision 1.01 software. It was uploaded online on 23 June 2024.[1]
It is the earliest known Microsoft Windows build to be released publicly, predating the official release of Windows 1.01 by two months.
Easter egg[edit | edit source]
It contains an easter egg: its bitmap 1 resource in USER.EXE contains only the obfuscated credits text, by a rolling XOR (start key at 0x4D, XOR byte of ciphertext with key, XOR key with plaintext byte, stop if plaintext byte is 0x1A).
The credits text is identical to that of Windows 1.01.