Windows does not allow some characters in file names including /
This is why ISOGEN replaces it with an _
If you try to manually rename the file with / you will get an error.
https://answers.microsoft.com/en-us/wind...e6-164887e7a11e


ISOWorx has the ability to rename it afterwards to get 0.75 but even then its not the best idea to use a decimal in a file name. Some software see the decimal as the beginning of a file extension. You would be better off leaving it as _ or rename to 075...