Cannot import files created in previous version of Dreamweaver

[#1]

I cannot import a "web-site" from which a help file is created using the MS help compiler. The individual files were created with DW 1 many moons ago and I now need to update them. The old .HHP file, shown below, includes reference to a Contents file and an Index file that also need to be imported in the new project..

[OPTIONS]
Binary Index=No
Compatibility=1.1 or later
Compiled file=..\HelpDH.chm
Contents file=HelpDH.hhc
Default topic=Welcome.htm
Display compile notes=No
Display compile progress=No
Full-text search=Yes
Index file=HelpDH.hhk
Language=0x809 English (United Kingdom)
Title=HypDeltaH

[FILES]
Data formats.htm
Equilibrium model.htm
Getting Started.htm
Heats of formation.htm
HySS.htm
Manual fitting.htm
New data.htm
Output viewer.htm
Refinement.htm
Restore.htm
Theory.htm
Titratiion data.htm
Welcome.htm
Samples.htm
Entropy.htm
Data collection.htm
References.htm
INI file.htm

[INFOTYPES]

[#2]

I cannot import a "web-site" from which a help file is created using the MS help compiler. The individual files were created with DW 1 many moons ago and I now need to update them. The old .HHP file, shown below, includes reference to a Contents file and an Index file that also need to be imported in the new project..

[OPTIONS]
Binary Index=No
Compatibility=1.1 or later
Compiled file=..\HelpDH.chm
Contents file=HelpDH.hhc
Default topic=Welcome.htm
Display compile notes=No
Display compile progress=No
Full-text search=Yes
Index file=HelpDH.hhk
Language=0x809 English (United Kingdom)
Title=HypDeltaH

[FILES]
Data formats.htm
Equilibrium model.htm
Getting Started.htm
Heats of formation.htm
HySS.htm
Manual fitting.htm
New data.htm
Output viewer.htm
Refinement.htm
Restore.htm
Theory.htm
Titratiion data.htm
Welcome.htm
Samples.htm
Entropy.htm
Data collection.htm
References.htm
INI file.htm

[INFOTYPES]

[#3 · Accepted solution]

Forget about Importing. 

What happens when you use File > Open and browse to the  file on your hard drive?  

If it's a text file, it should be editable in ANY plain  text editor.