• save -i filename; //Save the active worksheet, graph, or matrix window to a file with new file format, file extension will be ogwu, oggu, ogmu 
• save -ij filename; //Save the active worksheet, graph, or matrix window to a file with old file format, file extension will be ogw, ogg, ogm 
• save -ik filename; //Save the active workbook as analysis template with the extension of ogwu 
• save -ikj filename; //Save the active workbook as analysis template with the extension of ogw 
• save -t windowName filename; //Save windowName into a graph or worksheet template with new file format, fill extension will be otpu for Graph, otwu for Worksheet
• save -tj windowName filename; //Save windowName into a graph or worksheet template with old file format, fill extension will be otp for Graph, otw for Worksheet
• save -di/-di1 filename; //Save the project as new file format with the extension of opju 
• save -dij filename; //Save the project as old file format with the extension of opj 

Also, use option X to Save With Format Determined From Supplied File Extension. Following switches are supported, -ix, -tx, -dix.

For example, 

• save -DIX %yMyProject.opj; //saves the project in the opj format with the name MyProject.opj
• save -DIX %yMyProject.opju; //saves the project in the opju format with the name MyProject.opju
• save -DIX %yMyProject; //saves the project in the opju format with the name M