The answer is that we support all 'desktop-type' Microsoft Windows versions from Windows 2000 and higher. Support for Windows versions before Windows 2000 was stopeed from SQLyog version 6.0 because full Unicode support is not compatible with those early WIndows versions.

Users (both COMMUNITY and ENTERPRISE users) that need to use Win 98/ME can request a copy of SQLyog version 5.32 (the latest non-unicode build) that will work on those versions-

Also note that Windows Operating Systems for mobile devices (the various 'flavours' of Windows CE) are not supported either.

We also support Wine on Linux and various Unix's (including the Wine-ports 'darwine' and 'CrossOver for Mac' on Mac OS-X). With Wine here may be some 'flaws' and 'quirks' depending on the Linux distribution/Unix type and the Wine version used. Most important known issues are issues with the 'favorites' and 'autocomplete' features.