Cannot open files with spaces in filenames in Homesite

[AndyH1]

I'm having a problem in that my homesite will only open files whose filenames have no spaces in them. ie example.asp will open, but example 1.asp doesn't

My settings under File Types for asp files are

Application used to perform Action
"C:\Program Files\Macromedia\HomeSite+\HomeSite+.exe" %1

Use DDE
ticked

Application
HomeSite+

Topic
System

Can anyone advise what this should be to correct this problem

I'm running Homesite+ under win xp

Thanks
Andy