Because this mod is often hosted on third-party file-sharing sites, always run downloaded .jar files through a scanner like VirusTotal to check for malware or suspicious .exe extensions hidden inside.
The file "FapCraftModV1.0-Forge-1.12.2.jar" is a Java Archive (JAR) file, which is a compressed archive file format used to package Java classes, libraries, and other resources. JAR files are commonly used for distributing Java applications, libraries, and mods. file name fapcraftmodv10forge1122jar portable