Both Standard and Expert (D300win) are program loader software for the SX series. However, there is no compatibility between program data (called 'project') of these two program loaders.
You need to choose the same loader as the one used to create the project of the PLC on site. In addition, if the program is created by Expert (D300win), the project cannot be uploaded (read) from the PLC on site basically.
Obtain the project data from the vender who created it.
You can determine which loader is used to create the project from the extension of the file.
・Standard: *.Zpj (*.spj for non-zip projects), *.Zpj3
・Expert (D300win): *.zwt (*.mwt for non-zip projects)
* When a user ROM has been inserted in the CPU in advance and a zip project has been stored in it, you can upload the zip project from the user ROM.