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Screen shot of the window-based directory listing in SLOS-Win. Borland's Window Custom Control library was used, which provides its look-and-feel

Steven Lawrance's Operating System (SLOS), also known briefly as Steven Lawrance's Operating Program (SL-OP), was a small interpreted toy operating environment written in QBASIC for DOS. The primary motivation for writing this was to have an environment that supported long file names. This was written in 1993 -- two years before Microsoft released native long file name support in a consumer operating system with Windows 95.

A small subset of the SLOS commands were implemented in this Windows version. Unfortunately, this Windows version cannot run most of the SLOS programs that were written.