Mainsoft Corp, the outfit licensed by Redmond to provide the Windows application programming interface on non-Microsoft Corp operating systems, has gone to beta test with Object Linking & Embedding Controls for Unix. It is adding OLE Controls to its MainWin XDE development environment on Sun Microsystems Inc Unix for the beta release and on most other Unixes once MainWin XDE 2.0 is ready to ship late next quarter. The Mainsoft OLE implementation supports both OLE Control and Microsoft Foundation Class 4.0, a combination designed to enable developers to re-use original Windows source code, Foundation Class, resource and help files. The price stays the same at $5,000 per developer per system. Meanwhile Mainsoft Corp last week went gold with the latest version of MainWin, adding Windows95 Common Controls support plus Unix support of several Windows NT application programming interfaces including file and memory mapping. MainWin 1.3 now also supports Santa Cruz Unix 5.0, HP-UX 10 and AIX 4.0.