Pre-Freeze and Post-Thaw script file types?

in the documentation it mentions that for windows, VMware will execute all of the scripts in c:\Program Files\VMware\VMwareTools\backupScipts.d

or  /usr/sbin/pre-freeze-script

I assume  /usr/sbin/pre-freeze-script is a file name and not a diretcory, (can someone verify?)

for c"\....\backupScripts.d  -  what are the allowable file types in this directory? will VMware just try to execute all files in this directory so exe, vbs, bat are all ok?

thanks,

jonathan