VS2019 C++ Coding Help Needed

Attached are BMP_Crop.cpp + mytools.cpp + header file.
This is a very old app written for VS2010, and it still builds
fine using Visual Studio 2010. I'd like to have a version that
builds with a newer version of VS, ex: VS2019 or VS2017.
Build from VS cli as so: cl BMP_Crop.cpp mytools.cpp /clr

If someone with solid C++ skills out there wants to put
these 3 files into a folder and do a test build, pls try that.
If able to successfully build this BMP_crop.cpp app (*)
then please reach out to me and mention which version
of Visual Studio you used, and also let me know what
if any changes you needed to make to the actual code.

I'm guessing build errors I see when trying to build this
via VS2019 or VS2017 are due to no longer supported
syntax changes in the C++ code since when this was
written. Hoping someone can help me resolve this.

Am suggesting $25 for this. It's really not worth more
than $25 to me because if need be I'm willing to settle
for some bmp crop tool written for Python or PHP.

Side note: If someone out there has a working Python
or PHP script capable of cropping bmp files I'll consider
a separate project for you. Just let me know please.

(*)
Almost all code in mytools.cpp is irrelevant to this
app, but mytools.cpp is an old link file that's used.