VBS is a text file that contains source code written in Visual Basic. VBS is an Windows executable file an thus should be treated with caution as it may contain some malicious code. VBS files are alternatively saved with VB or VBScript suffixes.
After converting the file to the new format, you will be able to use other programs to support it. Keep in mind, however, that the VBA file after converting to VBS may differ slightly from the original. The most important information should be kept, but if you want the file after conversion from VBA to VBS to be the same, you have to do this carefully and choose the proper application from the list below.
There is no guarantee, of course, that the conversion will come up to all your expectations, but it will certainly help you. If, after all, the effect of converting VBA to VBS does not meet your expectations, you can simply try to find on the Internet a different version of your file in VBA format, properly converted to a VBS file by someone else. If this fails, use the information provided in the further part of the website.
Unfortunately, if after performing the two previously described steps (trying to find your VBA file converted by someone else, and the attempt to convert it to VBS on your own) you still have a problem with your file, then there are only a few solutions left. You can once again try to find and install an application that can open the VBA file in its original format (without conversion to VBS file). Such a solution will be difficult to implement, but it certainly will give the best result.